Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4a3a4c4434f166…

MALICIOUS

PDF

95.4 KB Created: 2021-04-20 19:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b661e18df14ab9e7087c58803289ff96 SHA-1: 51c6d943dba9eff07e4763e9457f88ff3163b98e SHA-256: fe4a3a4c4434f1664d6ef7d97bc9a82c9289e3f9853432798a2fbf788bb43c7c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/strik?utm_term=48+laws+of+power+reddit+books PDF link annotation
    • https://zavitakeji.weebly.com/uploads/1/3/4/9/134904790/menexikizuturunili.pdfIn PDF document text
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/a3482c5e.pdfIn PDF document text
    • https://cdn.sqhk.co/wejafivelij/x1lghji/widegetozemoxosux.pdfIn PDF document text
    • https://pojebozotez.weebly.com/uploads/1/3/2/6/132695867/3202608.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/iDijgi1/super_smash_bros_melee_adventure_mode_falco.pdfIn PDF document text
    • https://kobawepa.weebly.com/uploads/1/3/1/0/131070010/8419665.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://36d3fe4d-ce77-4ecd-ae21-04b42370c250.filesusr.com/ugd/871c54_c37a6b2e763745bebfa73fdf34747b83.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47872ea5-3bf5-41ec-9c70-e730c60c7284/dekoduvuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8878e5-15d4-4693-9f61-70db6a178a8e/29310183473.pdfIn PDF document text
    • https://4144cd26-5350-466f-b793-1bb211c0065b.filesusr.com/ugd/b5472a_70770dac79d54c62b66b4e179eccfb14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaec28ff-d7d0-4ded-8689-2ce3a2f7048e/gopita.pdfIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_3651180e6d6a4f09b773b73386a2d793.pdf?index=trueIn PDF document text
    • https://e4c06157-4c4c-4c30-848d-1ce07482e123.filesusr.com/ugd/99e070_24ef9001e04740908b5d9c6c07229467.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e68c8347-ec80-4c22-8e12-5d5edc91ed15/will_you_please_be_quiet_please.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f080d0e-6bf6-4138-855b-bf1dd5a76534/what_is_a_wake_for_a_dead_person.pdfIn PDF document text
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_b63d072de2ca40a4b47cd9a0cd9fde8e.pdf?index=trueIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_973ccdad9004483bb0b738154e6e236f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50568410-c143-4019-87ea-24af9650ed66/44080484641.pdfIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_223c71f15a354982a62ee2f0169ecb29.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off000103f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F6 5200 bytes
SHA-256: ce1791c8fd4cfd2d14feffe71431c615a54fa3d8f8512bf8f122530739fcb261
font_02_sfnt_off000115bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BD 2884 bytes
SHA-256: 1213b41b7171378c19388f350c6f9545fecce6a73c2540867fcbb71d0770df20
font_03_sfnt_off000121c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C9 11268 bytes
SHA-256: 30a94a0aa4230ff6c7f85166156a63b0c2bde1cf9f73dc19c4e2d3ec44857622
font_04_sfnt_off00014804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14804 17528 bytes
SHA-256: 27edce215f1788e097f27cf25cfcd7af7dbbdcd65af4fbf10d370635a31a5546
font_05_sfnt_off000160db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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