Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb721b79b435ad54…

MALICIOUS

PDF

80.0 KB Created: 2021-03-30 18:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8c55ef649504d0717f26e26d0d38a8f1 SHA-1: 1f3d313ed12e7c1d32d49972bcc573993654381b SHA-256: bb721b79b435ad542701c8f3eb86d36f027c16b3f85a0ac92174544454dbb537
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant portion pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of directing users to potentially harmful external sites.

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://soxebez.ru/strik?utm_term=what+is+the+hills+look+like+white+elephants+about PDF link annotation
    • https://cdn.sqhk.co/rujamuzizogo/giR41jM/28735810909.pdfIn PDF document text
    • http://pixxel.life/champion_generator_repairvf1ky.pdfIn PDF document text
    • http://abreudesigns.com/fine_woodworking_magazine_back_issuesazsq8.pdfIn PDF document text
    • http://doctora.club/math_facts_practice_sheets_2nd_gradem1jr7.pdfIn PDF document text
    • http://detonic-ro.website/cyprus_tourist_visa_application_form2ogjw.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/zdVjdje/rodok.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/tifM0gd/pabesoj.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/jb3Lji2/zombie_warriors_3.pdfIn PDF document text
    • http://ru-1.casa/6.5_grendel_reloading_datag39i1.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/zTjjjcw/picapart_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/26fce014-20c2-4f26-a194-e90066ead4ea/what_is_the_difference_between_adobe_pack_and_acrobat_pro_dc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b925de8-bfea-4ca2-8a8d-92b96a697c60/what_jobs_make_six_figures_a_year.pdfIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_1f331000cf2144f2bf92740e28d61bff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47667ee2-d7cd-47fe-a39f-75789d676b8a/zododibigamidepa.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_92cb2bc65e45431ea4fa9cddc2b27253.pdf?index=trueIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_d3cc4c9abc6f497fb035fe5a70f40b84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c16546dd-7127-4d69-9a4f-919ff2acae75/bepufaxixiwava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb4cdfe-627d-4080-ac90-a525a202e92e/who_were_the_nobles_in_france.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_f7b149a7a27e46d589d8ef36d3c53b89.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_8ab5f8fbe1dc4453b12e5bbbbd52a589.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e27832-6ae8-412a-a9f0-b3c4fed0d7b8/21395310022.pdfIn 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_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 5120 bytes
SHA-256: abd0d877dc7ea02244be6816a2e1839ada6dc242b886c44013e298ef5c858a95
font_01_sfnt_off00010baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 11388 bytes
SHA-256: 1811587af8d3c3aabb322c09ea6de2bc1f2599a32e9495929768f1d56f6d0465