Malicious PDF — malware analysis report

Static analysis result for SHA-256 da55c902fd7fc45f…

MALICIOUS

PDF

86.9 KB Created: 2021-04-27 05:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 104f86dc92acda28f2c64ce4615df677 SHA-1: 77438273e48e7688c59ed9163508077ca2b452e8 SHA-256: da55c902fd7fc45f73e0de0b7b3a74c2abdcea27b3f781f0dd11e2f72ae119eb
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' suggesting an attempt to redirect users to potentially harmful content. Although no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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=the+heart+of+darkness+summary+shmoop PDF link annotation
    • http://kidepokapila.22web.org/eba_guidelines_credit_risk_management_practices.pdfIn PDF document text
    • http://larediwavokib.iblogger.org/jogasofajomulekobi.pdfIn PDF document text
    • http://sibobovogulumu.22web.org/8626405626.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/boxalewijim/how_to_write_business_correspondence_letter.pdfIn PDF document text
    • http://lofufizopugopo.rf.gd/how_to_make_a_half_treble_crochet_stitch_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/gunijufig.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/91231374647.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/que_es_un_archivo_autorun_exec.pdfIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_10d5594c4ec443ec80d5d493cfc13673.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/nordictrack_x11i_incline_trainer_reviews.pdfIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_6f19d2f77ff7434a94785c6d6c6dbd0b.pdf?index=trueIn PDF document text
    • http://belajuba.epizy.com/call_of_duty_mobile_apk_mediafre_2019.pdfIn PDF document text
    • http://kogiwosewa.rf.gd/nifigugifilopaxawego.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/jijekonagavikila.pdfIn PDF document text
    • http://vonimamodiji.rf.gd/ge_7fa._03_fact_sheet.pdfIn PDF document text
    • http://xivuzadozazul.epizy.com/quentin_miller_combination.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_3ffec20c845c4af480e49607c1583fca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazixipame/vubagadolutaduga.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_fca13b33b2004dc884f75685b578ae50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jovekus/6144946655.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_85d84e099d0045918686b2c8293533f1.pdf?index=trueIn PDF document text
    • http://fuxefav.epizy.com/romurufanibi.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/gajijimetuteb.pdfIn PDF document text
    • http://velosipu.epizy.com/ejemplo_de_dialogo_formal_en_frances.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/vibawijofumawurika.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_off00011784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 5364 bytes
SHA-256: d261be2fc2581aaf75e2e9d9e37ca01879825b88dda5274a96454a0a16f64470
font_01_sfnt_off000129a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A5 10816 bytes
SHA-256: 75906cb07e9837ba1d62f224a4e5d675ba51b13d5b100031217a7ef5073bbdcf

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