Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d705b4ade8fe0e2…

MALICIOUS

PDF

61.0 KB Created: 2020-11-10 16:27:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 47f546ecee0eb57c0adf5a660b3535ad SHA-1: 8a6946228c6dd58cf6b2195311ee2098e3215b18 SHA-256: 8d705b4ade8fe0e2b864a50de5d010600afe9e1cfe20f6e3c779459b52223fbe
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF files, suggesting a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a high likelihood of malicious intent, specifically a free-download phishing lure. The embedded URL https://trafffe.ru/123?keyword=dna+and+replication+worksheet+answers is a primary indicator of compromise, likely leading to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffe.ru/123?keyword=dna+and+replication+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414153/normal_5f95e49036fec.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/kexowelariwu_juwinaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_5f9e6ea9f1c49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/33eb2d67-1f3c-4121-8b56-846e21bd74c2/noduza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d19e1f35-cb81-4c02-b4d7-92c267aa6433/wogadekujabed.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/weight_gain_eating_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeb6e89c-647b-487b-afe3-7906aaaefd78/download_gloud_games_hack_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adeda558-27c4-4390-a8d4-081fba212936/mozikuvijavamopivisifi.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/mafasebuwakanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4616fca-a593-42cf-8140-197d0514e379/gun_blood_2_cheats_shotgun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c94f3dd8-6eb4-4ec1-97a4-6e08de8d1306/98814121386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78c2fb52-3846-418f-ab04-11c8fb7fffa6/how_to_hack_khan_academy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ef2756-73b3-4934-bac4-f7682d7e9f1d/nenebakaweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1fd929-bcbc-4a12-8fa6-c378209df06c/samise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ebf2cfa-a429-4d47-9c73-292d72a3b57d/30214681420.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_off0000b353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB353 5316 bytes
SHA-256: feafb7404c9e174cf600c78a66410239008158c383f5c2ec8b617d83dcfe3130
font_01_sfnt_off0000c576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC576 9820 bytes
SHA-256: 357013656ebd3fe177df6f9461d31bee2f069bbe6f07d313ab7c626e8c8fa56e

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