Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d4fcb1447ff0ac…

MALICIOUS

PDF

73.3 KB Created: 2021-02-06 18:22:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 807771b6ec59abb5935e962f09c60220 SHA-1: 3aada1624a5fcff8f2cc52f0c38802c4ee271560 SHA-256: b1d4fcb1447ff0ac23e67ccc15c55a74234f2809e3c98d357ef6680a2c710ff5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the nature of the PDF and its embedded links points towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/aws?utm_term=answers+for+thank+you PDF link annotation
    • http://unityfree.xyz/carcassonne_safari_ruleslg10k.pdfIn PDF document text
    • https://cdn.sqhk.co/ninivaxibab/d1gceTx/15964388501.pdfIn PDF document text
    • http://ryukzak.digital/tazitelozo51y1a.pdfIn PDF document text
    • http://adminhalil.com/canonical_correspondence_analysiswjc1w.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/delorisogatar-timasuta-wotepilanig-gupotibi.pdfIn PDF document text
    • https://xugomijomib.weebly.com/uploads/1/3/4/5/134578432/nexawebelemo-bipedurafi.pdfIn PDF document text
    • http://idealsit.fun/3148808755yg2b6.pdfIn PDF document text
    • http://alania365.ru/lilubazeziwavatasuromekizxtstj.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/RHLEIhb/furirexoraxusezal.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/i5cidSS/besoccer_soccer_live_score_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://libejejizu.epizy.com/dandelions_ruth_b_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/adventist_fundamental_beliefs.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/powerpoint_template_for_church_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/yealink_w60p_quick_start_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/lean_startup_canvas_template.pdfIn PDF document text
    • http://tabifewegijip.epizy.com/laliwas.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/the_acacia_strain_wormwood.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_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 5072 bytes
SHA-256: 2c3e1dcba5dfce61629b99887f962db88f3f53a3ab8fec193a6cf940f4384640
font_01_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 10280 bytes
SHA-256: 857dc71499244c0ca8dbe2d750992a91fb593fe7cbe0e2beced7ae21bc5c6adb

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