Malicious PDF — malware analysis report

Static analysis result for SHA-256 967210f5c2806a1e…

MALICIOUS

PDF

87.2 KB Created: 2021-04-08 09:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: baacbd8d188ba267872ebb2fef96cfee SHA-1: add9ba96eb7cc4556b6cb690c60f64eaf21394fc SHA-256: 967210f5c2806a1efa859535ea31e9e0535e667cf1752b97ce9dc4117c4cb54a
186 Risk Score

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 0.9996

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://xajibur.ru/wix?keyword=amnesia+the+dark+descent+hard+mode+guide PDF link annotation
    • https://cdn.sqhk.co/jomonufo/gcNeggo/6228461432.pdfIn PDF document text
    • https://cdn.sqhk.co/bikulatitaxe/XZhhidH/brother_bear_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/zEia5MU/nintendo_switch_console_bundle.pdfIn PDF document text
    • https://jabukosiw.weebly.com/uploads/1/3/0/8/130874379/5d221c043e94b.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/fje1Kij/beyblade_burst_rivals_mod_apk_2._8._1.pdfIn PDF document text
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/fc1b7b72c2.pdfIn PDF document text
    • https://wojawiso.weebly.com/uploads/1/3/0/8/130813991/7ae97.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/ha2gd4D/stay_alive_cast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_08d4334d4b2044a8ad93ab3702d016e5.pdf?index=trueIn PDF document text
    • https://acaa17bf-cf2e-4132-a9e9-810271eb8bc4.filesusr.com/ugd/ab5b4c_31611978eefd4fed92e5f48b6236111c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/415e3dfa-9fea-4356-ab20-47568f0b7e2b/how_to_compute_ip_address_and_subnet_mask.pdfIn PDF document text
    • http://doruzedom.epizy.com/predator_generator_4375.pdfIn PDF document text
    • http://nuwovoma.epizy.com/american_english_file_3_student_book_free_download.pdfIn PDF document text
    • http://nukisiboviwal.epizy.com/fugopafovarosedabedowapu.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_34179c4776d04920ad213b8183694bd7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb95625a-71f9-4a73-8e98-099112d0fdd2/19967529251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9688e5f-351d-43ea-a8f5-90d389b4d47f/juvudokitipuriguguxa.pdfIn PDF document text
    • http://zorumiwopa.rf.gd/android_auto_cars_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce5426cb-15fa-4d3a-a774-8876a8555d9d/what_is_philippine_constitution_summary.pdfIn PDF document text
    • https://56076a71-1b70-41e8-afe1-d547c394b4ee.filesusr.com/ugd/ab0d05_e33f411e8e074ae9b7094bf3fe6f1ab1.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_21d46167e1614231ba65d00faaac2726.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 5372 bytes
SHA-256: 4f49affd2b706e149d5033850a551ecb1d538e21c89e32631792e096eec3b4d9
font_01_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 10664 bytes
SHA-256: 96901b719cf31f9942a36899dc41e865288eba98a80f2524aa22464dd102651c
font_02_sfnt_off0001304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304A 18648 bytes
SHA-256: 67960d2d785e6d4da4cac941051cb2ee00292f261c2a84d881aaf6cadc914844