Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e82fd052a73c80…

MALICIOUS

PDF

77.3 KB Created: 2021-03-15 08:28:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e76c95e0365f3a1f5681f5911ad9241c SHA-1: 93add2f46296462c8738a987bfe2879796c41ec0 SHA-256: a0e82fd052a73c8034b050250c3e04b292643b21e46624ac554642fb2bb260d7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm. The primary URL, https://dafemum.ru/strik, is likely used to redirect users to malicious content. Heuristics indicate this is a disposable link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious nature.

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.
  • 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://dafemum.ru/strik?utm_term=bob+evans+6+cheese+mac+and+cheese+calories PDF link annotation
    • https://rogefuza.weebly.com/uploads/1/3/4/6/134688393/2114229.pdfIn PDF document text
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/7bba5ee2a2a903.pdfIn PDF document text
    • http://pressit.space/81092097620wpg8y.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/39906757325.pdfIn PDF document text
    • https://mitumeme.weebly.com/uploads/1/3/4/8/134879381/5553398.pdfIn PDF document text
    • https://fadufavibog.weebly.com/uploads/1/3/4/8/134889314/malomezub.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/kikadodukuvotukog.pdfIn PDF document text
    • http://powerpoint4you.ru/vokakadulexulotovatilix29578.pdfIn PDF document text
    • https://sevexuwajewedov.weebly.com/uploads/1/3/4/5/134508994/gaxozamodip.pdfIn PDF document text
    • http://lisolu.org/daromafujerotnn71f.pdfIn PDF document text
    • https://gobibozuvabi.weebly.com/uploads/1/3/4/6/134683572/3842141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dafuwinev.myartsonline.com/general_motors_diet_plan.pdfIn PDF document text
    • http://nedizilunok.myartsonline.com/22137390698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb6c93d-6136-4327-beca-cdf0efd033e0/how_to_change_batteries_in_midland_xtra_talk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0db550-2e77-4983-bc2a-4fb98b0d7918/95939654194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3fca38d-9a07-433b-bde4-d9f161a4e451/remibumiwebipiwetasowa.pdfIn PDF document text
    • http://tivakifuzir.atwebpages.com/fupegejavetojavadatizefa.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/budom.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/bose_companion_3_series_2_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/136bc426-cb11-4404-b069-44e2627f114b/76878199068.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/b1_free_archiver_pro_apk.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_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 5580 bytes
SHA-256: e59bdb83b5303e411a0eeb561eff32b39217fccf336d5c4fd3594617ae16c752
font_01_sfnt_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 11244 bytes
SHA-256: c565ddcb8b9c27d63fc9e66c6770365432a4cbb3dd2284edd1ed8d15584f261c

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