Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab7f4b39a6f800e…

MALICIOUS

PDF

96.7 KB Created: 2021-01-10 13:29:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a27cb2961f0725f7b0d4cf0b98ce9899 SHA-1: 7813fa8852dad74b464cfb3fdc20321ae12e0fbd SHA-256: 4ab7f4b39a6f800ea40d0eda1935bd3dc50e541d5aef25251764d9a2053cc3fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains numerous embedded URLs pointing to disposable domains and a link farm, indicating a phishing or redirection attempt. The presence of 'utm_term=land+druid+feats' in one URL suggests a marketing or tracking component, common in phishing lures.

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 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://trafftec.ru/123?utm_term=land+druid+feats PDF link annotation
    • https://babaxumo.weebly.com/uploads/1/3/4/3/134379683/e955bf9e999.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/sojesuvojoz-kokuvowam.pdfIn PDF document text
    • https://site-1178602.mozfiles.com/files/1178602/79139514955.pdfIn PDF document text
    • https://site-1172860.mozfiles.com/files/1172860/66772984118.pdfIn PDF document text
    • https://site-1168133.mozfiles.com/files/1168133/ncert_solutions_of_ncert_books_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/faruzikako/i7gdWLS/tobafanifasozozis.pdfIn PDF document text
    • https://site-1178453.mozfiles.com/files/1178453/mobile_data_turns_off_automatically.pdfIn PDF document text
    • https://site-1174882.mozfiles.com/files/1174882/brightwaters_farms_bayshore.pdfIn PDF document text
    • https://site-1178670.mozfiles.com/files/1178670/51713648847.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/laradusa/14988533473.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/free_printable_piano_sheet_music_feliz_navidad.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/china_embassy_visa_form_bangladesh.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_off00014178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14178 4808 bytes
SHA-256: 003cddb7c76ed4837ca4bf5f56335b149dc2badc596689bfc855e17904ff7ed9
font_01_sfnt_off000151e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E2 10716 bytes
SHA-256: 5bec72429aa7c73d1ee387560cdcd5621b8314bb87491b2f429dcedcbed7657b

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