Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28511a23c5fc4e7…

MALICIOUS

PDF

73.7 KB Created: 2021-01-11 18:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 829f655a5e449368ba754326baf0656e SHA-1: 9e7340eb92738d62456c216c30355f0a75a54848 SHA-256: e28511a23c5fc4e747e92d7d95c1595fe9712e9976c402726484193b5a94c91a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to benign-looking PDF files, but one key URL, traffset.ru, is flagged as unknown and is likely part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document's primary purpose is to redirect users to potentially harmful websites.

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://traffset.ru/aws?utm_term=sapna+choudhary+songs+video++pagalworld PDF link annotation
    • https://site-1178617.mozfiles.com/files/1178617/18306034098.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454280/normal_5fec92f731fb4.pdfIn PDF document text
    • https://cdn.sqhk.co/wunemuruk/njdCFP1/birthday_cake_decorations_for_mom.pdfIn PDF document text
    • https://tazeviguso.weebly.com/uploads/1/3/4/3/134339516/2757a.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/jjihkNN/king_s_wife_game_of_thrones_season_1.pdfIn PDF document text
    • https://jinepesel.weebly.com/uploads/1/3/5/3/135346763/4173905a6fcb.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/geUghic/19366867095.pdfIn PDF document text
    • https://cdn.sqhk.co/vikoparif/cgchhj7/84809795100.pdfIn PDF document text
    • https://site-1083792.mozfiles.com/files/1083792/reverse_image_search_to_find_someone_on_facebook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/kewakuko/diagnostico_de_neuralgia_del_trigemino.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/89433564162.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/outlook_email_signature_template.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/60249206940.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/workplace_bullying_policy.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD43 5692 bytes
SHA-256: 8f4c453f497dd65c926a4066b4a39646729ad55f6a5718b1e262d0e14dee43a0
font_01_sfnt_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 10240 bytes
SHA-256: 87ecd4e7e5f0254c24d51165b3020dbc4bccf61b14a381740ea3e65bb27b3b9c
font_02_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 6256 bytes
SHA-256: 54225a217bca42e6e9dd0b771f1e81842f687a48f3e9592710645bac5054da23

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