Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0523bb7bbbc3ea…

MALICIOUS

PDF

89.1 KB Created: 2021-05-25 14:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fa6785026b95b1ec7258a248c36e7795 SHA-1: 213a6ae07fa91fcc71da155d7f1fe77cb6ca701e SHA-256: dd0523bb7bbbc3ea0b2079a51a4780ef45f850c532be3e96f8322b783be002b4
186 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The primary URL, 'https://vilenefex.ru/strik?utm_term=abs+cbn+tv+plus+software+upgrade+download', is presented as a software upgrade download, a common social engineering tactic. The presence of ClamAV and ML heuristic firings, along with the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM rules, strongly indicates malicious intent, likely to redirect users to a malicious site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=abs+cbn+tv+plus+software+upgrade+download PDF link annotation
    • https://jukejifoka.weebly.com/uploads/1/3/5/3/135311866/kigejizodo-totor-jatajegurevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_6013a6831e6d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5fc8bb63cc132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489035/normal_605e176029c79.pdfIn PDF document text
    • https://weginufakitin.weebly.com/uploads/1/3/4/8/134846544/dumut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_60136cab09293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481819/normal_601de526af229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_6066f931e6f07.pdfIn PDF document text
    • https://puzilefamurujuz.weebly.com/uploads/1/3/2/7/132712080/5e7db.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/nibujikujizaf_wimon_welixerutimijof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446270/normal_5fcc8f41bc5c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384470/normal_5fef88afa04bb.pdfIn PDF document text
    • https://namerodedisa.weebly.com/uploads/1/3/4/7/134771167/tabatome-dipirugag-fuwujajokopab.pdfIn PDF document text
    • https://zanolidades.weebly.com/uploads/1/3/2/6/132695759/1f408.pdfIn PDF document text
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/lakuwezizexajudafulu.pdfIn PDF document text
    • https://mabexerezigija.weebly.com/uploads/1/3/5/3/135324341/dc1b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/17089327561.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/what_is_the_authors_purpose_in_the_crucible.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 5260 bytes
SHA-256: 801eee0f5abf9706f6c4d9ec8de800e9492372c8ccdee356ed72d1fcbf569441
font_01_sfnt_off00010702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 5604 bytes
SHA-256: 0004f5baa3add86f404886f3946301986d8aa833a6c7788e3dd0192cc7c9fe82
font_02_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 11444 bytes
SHA-256: ef9b8c96c421959997a46df10562f1a5758e2e2fbe2fe0f2f68be1f972747199
font_03_sfnt_off0001414b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414B 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b