Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4802264ae243198…

MALICIOUS

PDF

131.5 KB Created: 2021-03-24 05:30:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1488837b6b003707578efb05988f8d5b SHA-1: 57755b500c3c9638aee626dc3bf16f9407fa126a SHA-256: d4802264ae243198a15dac5e795acbbbadaafa973a14b2b022d82cb67a1d78c7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary one pointing to 'dugedepap.ru', identified as a link farm on disposable hosting. This suggests a phishing or scam attempt, likely using the guise of academic material to trick users into visiting malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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 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://dugedepap.ru/award?keyword=linear+algebra+maths+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465402/normal_6007c9b36444f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_60522c0f14445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468572/normal_60565b2d47523.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405440/normal_6003bad7e580e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416805/normal_5fdc997a296e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474457/normal_604f84313828d.pdfIn PDF document text
    • https://wigowuwadapol.weebly.com/uploads/1/3/5/3/135315864/lofetaxomazifizotopo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459036/normal_604b74efef85a.pdfIn PDF document text
    • https://xinotetul.weebly.com/uploads/1/3/5/3/135351743/1244638.pdfIn PDF document text
    • https://gekaketiba.weebly.com/uploads/1/3/1/4/131455198/tukexojovutuvep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451025/normal_6006b2c25a7ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_60235ac0a947d.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/caf1aa9a-c25b-4c3c-99d7-f633b8e986f0/dububifab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a53f5c5a-9e93-437d-964a-caa664722fd0/12192689301.pdfIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_c492fb7bfae04b27aeac88136e8100f7.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_70fae244f20d46418fb527e3f0a537d5.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_ec51311f506048c7ac4be78794e178c4.pdf?index=trueIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_9b597e3afb01424c830915424d87bbda.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_91dfe840313146ebb3f01acdb3659f34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90a42593-f164-4f84-ad6a-5d8bdc75facd/plt_voyager_legend_pairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbed1d37-295d-4c8b-bbe8-e483f648d259/71093978085.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_off00019dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DFB 5536 bytes
SHA-256: 5e21cba974ffc76687f922501c41f2b48653d494423fe171c913f53cdc03c5a2
font_01_sfnt_off0001b09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B09A 2172 bytes
SHA-256: e898010427f8b6d918e446b9b13f852d93f7c8cf29bcbec3cb1571e36c962f37
font_02_sfnt_off0001b9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9FD 13168 bytes
SHA-256: 23ca6a8a53299105d42768473c3f053a5ab3377c974004417ed279cd639a6fa6
font_03_sfnt_off0001e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E626 17148 bytes
SHA-256: 3029d80a1810eee9514b609750563613dc686c2da235ec8ae0f9fe3297aa80d1