Malicious PDF — malware analysis report

Static analysis result for SHA-256 53335bacfc1d028a…

MALICIOUS

PDF

73.5 KB Created: 2021-02-22 16:52:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ae0f688d59492ce15e87e40cacd4ee43 SHA-1: e2e8fbb80e26771d5b62a5c846b9f88e05948677 SHA-256: 53335bacfc1d028ac43899eba35a3f7366fbc01ab8831ce29797e9ec0cd03e2e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on Weebly, suggesting a link farm or phishing operation. The presence of a URL related to 'facebook help chat room' indicates a social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=facebook+help+chat+room PDF link annotation
    • https://gajatizu.weebly.com/uploads/1/3/5/3/135315297/4489692.pdfIn PDF document text
    • https://fenorepaxok.weebly.com/uploads/1/3/1/8/131856491/folirijiredod.pdfIn PDF document text
    • https://lonufiwinejuf.weebly.com/uploads/1/3/0/7/130776555/84efe25a13a5.pdfIn PDF document text
    • https://tiwudusakuwizir.weebly.com/uploads/1/3/1/6/131637104/eb8357e001.pdfIn PDF document text
    • https://jigupipugefelo.weebly.com/uploads/1/3/4/3/134387822/9644987.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/3859283.pdfIn PDF document text
    • https://kibixaxetoro.weebly.com/uploads/1/3/4/8/134861284/2b3a8d5.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/913744.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/9667409.pdfIn PDF document text
    • https://satataro.weebly.com/uploads/1/3/5/3/135350270/9429761.pdfIn PDF document text
    • https://begosibaluta.weebly.com/uploads/1/3/0/7/130775163/moxinikavipufoso.pdfIn PDF document text
    • https://tasitonedilegu.weebly.com/uploads/1/3/5/3/135301248/zafiji.pdfIn PDF document text
    • https://puxizabub.weebly.com/uploads/1/3/1/4/131406372/nopegip.pdfIn 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://s3.amazonaws.com/mosezavor/vizufijovunukavapiz.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/mosup.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/html_form_validation_without_javascript.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/investigative_report_writing_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/delta_life_insurance_bangladesh_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/8148151690.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/browser_complete_event_javascript.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 4788 bytes
SHA-256: ffcc6e469c2fde690c5621575b8ccd736e05d31c2e7ab9461877255a8349f5ac
font_01_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 10044 bytes
SHA-256: 0906013a4bdfa0bd569349203ecc7914522d736edf9379fdc16f62ad333d3bfa
font_02_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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