Malicious PDF — malware analysis report

Static analysis result for SHA-256 db81a99f49349cf4…

MALICIOUS

PDF

82.6 KB Created: 2021-05-25 00:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 541ebe8952630e506fc07f839ddce696 SHA-1: d9dd01abccb064009cd89562b69efca4a76be67e SHA-256: db81a99f49349cf4124bd53335a28dfa94523a1d6d76b478416f1357d80a8419
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/strik?utm_term=download+kmspico+windows+7+ultimate+32+bit+bagas31 PDF link annotation
    • https://gegirugotosizuk.weebly.com/uploads/1/3/5/3/135397722/menulijaj.pdfIn PDF document text
    • https://jeduwenerapowi.weebly.com/uploads/1/3/4/6/134678879/dafasowiru_dobupipebisak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_60451574c8e52.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/dukufuwadenuxe-dobemomuseg-sapefo.pdfIn PDF document text
    • https://tozikogok.weebly.com/uploads/1/3/5/3/135330875/3243046.pdfIn PDF document text
    • https://tobevasisutigi.weebly.com/uploads/1/3/0/8/130814636/81db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_603eb2b83d5a4.pdfIn PDF document text
    • https://lufuzanexitib.weebly.com/uploads/1/3/4/8/134859686/49b9bccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_60436b888bd77.pdfIn PDF document text
    • https://wojuruwebibok.weebly.com/uploads/1/3/4/2/134266806/796695.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/nitizobuv/2531232976.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/junusexugoxelorodexiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bbb012b-cdc9-454c-b606-319d431d4a48/14085978522.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/fuwozibanebal.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/ac_market_apk_revdl.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/dufasekope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/945e96a7-21ab-4510-8fd1-56729437f4ea/bolalepupi.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/10118449847.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/how_to_learn_basic_japanese_words.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/60923423184.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/62552751176.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

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_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 6020 bytes
SHA-256: 93f0de9beaf2bfe84d5f3b8f3fd00bfe7b03d9a9118674b1d13fc66d35e2f9f2
font_01_sfnt_off00011760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11760 10992 bytes
SHA-256: 5f5cfc3b35e49be97d5785a6a5e8f909470a8848a1a7f368dc6493722f9cc40c

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