Malicious PDF — malware analysis report

Static analysis result for SHA-256 e131712d85e3684f…

MALICIOUS

PDF

74.4 KB Created: 2021-04-02 05:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4d554aefb500f37d4341939e20b31d2d SHA-1: 23e3617cad9e02bb588e98c45f1b724618faf69d SHA-256: e131712d85e3684f1e53f8b5f91ca0e7dbe8d69e53ef06754e26a8f16c018d49
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV heuristic strongly suggest malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, contains a title related to language development, which is used to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=how+to+encourage+language+development+in+the+classroom PDF link annotation
    • https://fujokexa.weebly.com/uploads/1/3/5/3/135304253/jilepemofofifupok.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/eaa54.pdfIn PDF document text
    • https://segurabo.weebly.com/uploads/1/3/5/9/135964373/fegiribalo-raveto-figugo.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/BjbJzhb/10530368172.pdfIn PDF document text
    • https://kejidelevotina.weebly.com/uploads/1/3/5/3/135326148/tomuduwumo.pdfIn PDF document text
    • http://pobasomitiji.22web.org/50593199779.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/vhfghd0/crossword_mysteries_season_1_episode_2_123movies.pdfIn PDF document text
    • https://cdn.sqhk.co/xotakuzazuf/3lhejhf/zovidawo.pdfIn PDF document text
    • https://musaseruvadix.weebly.com/uploads/1/3/4/5/134581888/dumamum.pdfIn PDF document text
    • https://kezidixujaroko.weebly.com/uploads/1/3/4/0/134040737/fokav-derupopuxovu-xoxivenir-ninupan.pdfIn PDF document text
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/c086c12.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/nonedanoziruvaseb.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/Whfmpnf/tujegomov.pdfIn PDF document text
    • http://tukameduk.22web.org/vutetimewas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wikatamuk.rf.gd/sawesobeseg.pdfIn PDF document text
    • http://kuxatirimupuv.rf.gd/tipos_de_anemias_en_nios.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_438f40df61784426bace62fd37c8add2.pdf?index=trueIn PDF document text
    • http://botozagelexi.rf.gd/android_one_nokia_3._1_plus.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_2e8dc3a424d543718028631c30e6d133.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 5600 bytes
SHA-256: 155ecf81dcfd3dd1718687c653dfbf4fba3361164b2181ad670d8aa3cccea04a
font_01_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 10256 bytes
SHA-256: e319fc6522df8d104c07f006f35932317974d87b968f4d109ba0f4b59f191e73

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