Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf55ab47f0734cf…

MALICIOUS

PDF

74.7 KB Created: 2021-02-26 02:32:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4b72571e2c0ad461f36b475378c0aede SHA-1: a8c0c90fabb3406f664c6116351e7b0412fb42b1 SHA-256: fdf55ab47f0734cff4972aa17423767282ca91118d44723fbaca9ee4514be1e8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links to other PDF files hosted on various domains, many of which appear disposable. This suggests a tactic to distribute further malicious content or engage in SEO manipulation. The presence of external URIs and a link farm on disposable hosting points towards a phishing or content distribution scheme.

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://baarspo.ru/award?keyword=hopper+sling+vs+hopper+duo PDF link annotation
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/6906240.pdfIn PDF document text
    • https://lapaluletegole.weebly.com/uploads/1/3/4/6/134679291/0fd16c.pdfIn PDF document text
    • https://sajulivos.weebly.com/uploads/1/3/1/1/131164476/zebutojetaxer.pdfIn PDF document text
    • http://twirlini.com/how_to_change_time_casio_telememo_30qbyp1.pdfIn PDF document text
    • http://lotsmen.com/subisojaximibifidesaxmcyti.pdfIn PDF document text
    • https://vojidejera.weebly.com/uploads/1/3/2/6/132695434/7016958.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/mubujovida-dudenobodu-jivojutaf-refote.pdfIn PDF document text
    • http://wivafojoki.22web.org/59509028482.pdfIn PDF document text
    • http://vawuxipofuf.iblogger.org/ramivinozogowijupijefa.pdfIn PDF document text
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/risezoluxirowoforev.pdfIn PDF document text
    • https://vipapixamez.weebly.com/uploads/1/3/0/8/130814430/9610ecd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 5032 bytes
SHA-256: 0b12f3785fdf76bceff027e9cfb6d2759a9a1c299c7ea2b424952415ea6974e8
font_01_sfnt_off0000f7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D3 11492 bytes
SHA-256: b1195c947f54ad52e76a11c79b185bf165daae7c05a9777cd932ee826fc29927

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