Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b46c28935998d3…

MALICIOUS

PDF

87.6 KB Created: 2021-03-05 05:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5dcce5e95bb54084e6cd393ebc601dac SHA-1: ec13501aabbfae0ea641f693f9f70cd3244f65ce SHA-256: f0b46c28935998d35aa6bcc10b949b763660462fcd0d10689e3e97ce267b719c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification yielded a high probability of maliciousness. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/award?keyword=is+the+husqvarna+701+reliable PDF link annotation
    • https://cdn.sqhk.co/kavejufa/icfiaEe/happy_birthday_teacher_short_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/Thhjcjd/cross_stitch_kits_for_beginners_australia.pdfIn PDF document text
    • https://vunusamonumated.weebly.com/uploads/1/3/4/0/134040658/jaridewedawezuza.pdfIn PDF document text
    • https://jelonuzekuxenu.weebly.com/uploads/1/3/2/8/132814084/cf4db8996.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/id8zw85/97047099482.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/xjiidia/gufepizarure.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/giigeuR/live_band_groups_in_accra.pdfIn PDF document text
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/mogufimalu-lizagagesapub-tazawesibejogip-zutaros.pdfIn PDF document text
    • http://natezaka.iblogger.org/chalanachitra_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/xarobumevux/ieWPjdx/second_hand_clothes_stores_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/hbRiigk/pachinko_fever_problems.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_9f378439fd7a4eb6a9d061a2890462bd.pdf?index=trueIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_a5714dc0c5ec454c9e8edb36097f7e74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/91582384265.pdfIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_b2611ab2d4664899be1fa83d20030714.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/what_is_the_most_dangerous_city_in_new_york.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_438793412e3c464c8ea77d964998e524.pdf?index=trueIn PDF document text
    • http://xetobagog.rf.gd/baidu_root_english_version.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_off00011b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 5308 bytes
SHA-256: c42e67aa1752ba880a9ec53d4085c67114ec267ba9ada66729c6e8938bd6d601
font_01_sfnt_off00012d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3E 10420 bytes
SHA-256: 4483020f7a13633e160119ad83d5d2ed50335610772272b0d1cb542e9d1829e3

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