Malicious PDF — malware analysis report

Static analysis result for SHA-256 9502154b7c17ce54…

MALICIOUS

PDF

107.6 KB Created: 2021-05-15 10:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0de47e1d5d383966330452594db1c04d SHA-1: db7a9643c355ce6bd66c8846754834e2c5b85cea SHA-256: 9502154b7c17ce54a912aeb84c4e9a232ce9f512d5a554b03f431e0764148eab
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to serve as a distribution point for further malware. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://lozipotod.ru/strik?utm_term=abraham+lincoln+biography+in+bengali+pdf PDF link annotation
    • https://tepukijamuboze.weebly.com/uploads/1/3/5/3/135301813/juginivawal-zikapupi-xofonusar-mivix.pdfIn PDF document text
    • http://opensalle.xyz/88179685656nklr5.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/lodawusozekifav.pdfIn PDF document text
    • https://nuvusutapisi.weebly.com/uploads/1/3/4/4/134460305/4c48e963d.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/how_long_to_study_for_fsot.pdfIn PDF document text
    • https://munerotilaxamo.weebly.com/uploads/1/3/4/4/134476206/jeruratad.pdfIn PDF document text
    • http://thelandofbadideas.com/aadhar_not_workingknbu4.pdfIn PDF document text
    • https://videxopefofima.weebly.com/uploads/1/3/4/1/134131768/75e24c5e5d3cf.pdfIn PDF document text
    • https://gofupadosu.weebly.com/uploads/1/3/4/8/134853885/wedode-datavoli-lemoxeni.pdfIn PDF document text
    • http://atomyimperial.ru/felime2gimb.pdfIn PDF document text
    • http://sq11mini.com/53272396412ds212.pdfIn PDF document text
    • https://wogijelagorezu.weebly.com/uploads/1/3/4/0/134096035/pujexasi_godejomapan_gipokege.pdfIn PDF document text
    • https://ketadamofexawun.weebly.com/uploads/1/3/5/3/135349072/4591116.pdfIn PDF document text
    • https://jowovodepavilim.weebly.com/uploads/1/3/4/6/134651336/548467c3c5efddb.pdfIn PDF document text
    • https://dewufore.weebly.com/uploads/1/3/4/8/134857007/5492571.pdfIn PDF document text
    • https://fumabufoduf.weebly.com/uploads/1/3/5/3/135313851/197060.pdfIn PDF document text
    • https://tugofemupufere.weebly.com/uploads/1/3/4/5/134584107/gegido_davefa.pdfIn PDF document text
    • http://kibesamifi.getenjoyment.net/pamatefenizupikizatafu.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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://uploads.strikinglycdn.com/files/82d0e370-747a-4727-a33e-d441acb6d109/foxarunalofev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c554224b-f32f-451f-8b48-3255ecbd5181/20970622109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8926770b-3984-492d-b5f0-0f4116f68f73/how_to_bypass_parental_controls_on_dsi_xl.pdfIn PDF document text
    • http://xenezipulugiji.atwebpages.com/agenda_2020_y_los_ods.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000169b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x169B7 18100 bytes
SHA-256: f1f2370de96399c0c001d4b1df6fe39a2e32f716ba4388d95d644e05651e11c2
font_00_sfnt_off00011b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B65 5328 bytes
SHA-256: 1c443d6058454324663b045a68a0148202dc9aefbcce284ecf32ead3190c89d1
font_01_sfnt_off00012d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D44 3720 bytes
SHA-256: a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9
font_02_sfnt_off000138a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A4 10252 bytes
SHA-256: 9f6f50cc4a040fbe605fa8ec725afd5516ac5f80192a581719bef00e6848cca1
font_03_sfnt_off00015bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB6 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230