Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8a0571e5fd58f9…

MALICIOUS

PDF

76.1 KB Created: 2021-02-09 18:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00214c6c57cb893b32a1013bb83c8512 SHA-1: d6f6b7e72d7b696ead1aeac2246b623e040cd110 SHA-256: bd8a0571e5fd58f98341f3b9a376772ad8ca49b796427b032045e12588e65152
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the structure of the PDF point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://leonvi.ru/wb?keyword=autodesk%20inventor%20view%202017%2032%20bit PDF link annotation
    • https://lixemuvoxowogod.weebly.com/uploads/1/3/4/8/134878154/kibibinivopute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487187/normal_5fe338a36e38d.pdfIn PDF document text
    • https://tozovugoji.weebly.com/uploads/1/3/1/6/131606343/5b39cf126.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/NmjhJx2/71716655427.pdfIn PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/vafewaju.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/xiitiiG/24648023656.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369914/normal_5ff80819a3dbe.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/b0c22a72e8.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuxona/etjItfY/98976251207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_60176f1ddc332.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491152/normal_6005f377afc7e.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/8881790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443803/normal_6010902482ff6.pdfIn PDF document text
    • https://wufanamokedig.weebly.com/uploads/1/3/5/3/135326106/sijadidarikexajaruj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_5fd6602bb7816.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 5492 bytes
SHA-256: b74eb33937cd0d9a7307b432c61713d8fec703a492e215a499645979d94d5731
font_01_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 19216 bytes
SHA-256: 6fbb47ea60b92354aea92cb7f9f68b66ae3e74692d78150e8dd42da2faab0f9b

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