Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad2711398da4ae7…

MALICIOUS

PDF

81.0 KB Created: 2021-01-21 21:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9b9d6b5ef6043575d6b7a92a94980f4e SHA-1: ee137f07839449fcdea83b1437d693332058a088 SHA-256: cad2711398da4ae70370ea5a1a06be099820f627fe986391940a9e50caf3c749
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, likely to obscure malicious destinations. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect the user to a malicious site or download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://bologen.ru/123?utm_term=dental+terminology+for+dummies+manual+pdf PDF link annotation
    • https://site-1176001.mozfiles.com/files/1176001/cosmos_possible_worlds_episodes_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/uifWggq/74839108514.pdfIn PDF document text
    • https://tiruvodeg.weebly.com/uploads/1/3/4/8/134892329/lolumukisasufij.pdfIn PDF document text
    • https://site-1173807.mozfiles.com/files/1173807/64817514156.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/bflvcjc/happy_face_with_sunglasses_emoji.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/gm2xmRe/dopugunan.pdfIn PDF document text
    • http://zijiwox.iblogger.org/apple_store_for_pc_free.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/0547c169bf5755.pdfIn PDF document text
    • https://site-1239280.mozfiles.com/files/1239280/wepewikizuvedopibi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501027/normal_5fddd01c0fc26.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/egjzfjd/fogelilapibunop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463279/normal_6000032fba4c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484612/normal_5ff9c468c5723.pdfIn PDF document text
    • https://site-1175994.mozfiles.com/files/1175994/talezikobifupifodefupij.pdfIn PDF document text
    • https://site-1206652.mozfiles.com/files/1206652/difference_between_slice_and_dice_in_olap.pdfIn PDF document text
    • https://site-1176876.mozfiles.com/files/1176876/sijinozonoposofomo.pdfIn PDF document text
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/7328235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407795/normal_6007a40972b5a.pdfIn PDF document text
    • https://site-1176192.mozfiles.com/files/1176192/fumaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gozotonitiki.epizy.com/kawizizarukijukedetumugi.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_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 5344 bytes
SHA-256: 9e6b712d1ca0ecfb16838db983e0c5f8df0df9e2c941e643938f59e3b6c34df6
font_01_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 10192 bytes
SHA-256: 81bc6e6fd82106323f4de1f8f58e3e62cda95f7cc60b5a51c027dd12d36f9dda
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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