Malicious PDF — malware analysis report

Static analysis result for SHA-256 40aea9dc9f2e10e2…

MALICIOUS

PDF

75.9 KB Created: 2021-05-10 04:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 97475bc209a624b6fe2d76bead596303 SHA-1: 7337bb1530e642560065f0f53db67c7bae478816 SHA-256: 40aea9dc9f2e10e20627023099a15f3f8cba3771bc2ffab46749411bb32f9b35
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 0.9998

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://mezovuduw.ru/strik?utm_term=dungeons+and+dragons+races+wikipedia PDF link annotation
    • http://kifenefazujiz.iblogger.org/how_did_europe_recover_after_ww2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366399/normal_6007ec9bf12de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379841/normal_5ff6a632138c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_6040d6e0db4c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490369/normal_5fce255e7cbe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_5fda43c000d88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_600e4673bb281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471488/normal_5fd7f2d19f571.pdfIn PDF document text
    • http://pifofumega.22web.org/xozuxizaxonawewip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446761/normal_5fe94ac33587c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_6a037deb572e4baf9b86f2c1127d76e6.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_0243138c3ed5441daa1940eed524149c.pdf?index=trueIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_bb06f78d73a84caa8d9d6a98004f5a27.pdf?index=trueIn PDF document text
    • https://fe4fa097-7109-4367-a76b-bc1f2b7936f3.filesusr.com/ugd/ef6f93_6da2a53c645d4d91832465893be56ff4.pdf?index=trueIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_56b9e43d70664adeaf10fcba5fc82f13.pdf?index=trueIn PDF document text
    • http://nevoludez.epizy.com/potensi_biomassa_di_indonesia.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_b5c469b9844a4d69b48e52dbdaff3d43.pdf?index=trueIn PDF document text
    • http://forarevepezifu.epizy.com/hemoglobina_corpuscular_media_baja.pdfIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_acb68a06f3a7487ba6152ece4198d076.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_537f90a7b0ac403988cb2124d9ff10bc.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 5364 bytes
SHA-256: 9949ecefb65e08b90c8d7c6d82cec3cbf36dd9145282f920004089269278849c
font_01_sfnt_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 10740 bytes
SHA-256: c9353b9eb44d3361f75112c0f94db9f25b17f5c2a15274cb5c607ad17d383055

Open this report in the interactive analyzer, or submit your own file for analysis.