Malicious PDF — malware analysis report

Static analysis result for SHA-256 a740c7c2eb271799…

MALICIOUS

PDF

121.8 KB Created: 2021-03-02 12:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a43806168ec235f68f7365e76bb9ad8d SHA-1: a2c1c2fcec3f7fb826c91a8084c9eaa7488897ee SHA-256: a740c7c2eb271799fee19620782d6e470554e0cbf596981aaa9797f105bcd5df
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs pointing to disposable hosting and link farms, suggesting it's part of a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure strongly suggest it's intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xajibur.ru/wix?keyword=matilda+musical+script+pdf PDF link annotation
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/dunupulanepazetu.pdfIn PDF document text
    • http://kind-insta.site/2._1._4_super_cleanup_karel_answercyxjp.pdfIn PDF document text
    • http://copyrightram.net/35780327868m73c7.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/menegugoveporekegit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5fffaf356db6d.pdfIn PDF document text
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/gewewo.pdfIn PDF document text
    • http://obmenkalnr.online/in_the_time_of_the_butterflies_chapter_5-8_summaryd7fmk.pdfIn PDF document text
    • http://tehnomaster.net/48934681134s3901.pdfIn PDF document text
    • http://gufutaca1.xyz/nibixuqdly6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_602c36f7ba7c5.pdfIn PDF document text
    • http://euroshopmn.space/jecha_beektotaa_addunyaaeznwg.pdfIn PDF document text
    • http://halfraire.xyz/2015_honda_accord_coupe_owners_manualmk1ri.pdfIn PDF document text
    • http://afracheat1.xyz/rumidebopawazadmsih9.pdfIn PDF document text
    • http://svoydvalend.xyz/60993577626fgmei.pdfIn PDF document text
    • http://usacreditreport.info/ge_nautilus_dishwasher_installation_manualal4c3.pdfIn PDF document text
    • http://productwood.ru/bamufakhgwjs.pdfIn PDF document text
    • http://flowerport.market/free_book_of_shadows_download0h4fz.pdfIn PDF document text
    • http://potenciy.xyz/75519015713mb2tq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370989/normal_5fcd75e2a42a1.pdfIn PDF document text
    • https://dakawomafi.weebly.com/uploads/1/3/5/9/135959339/mifiluwijipojona.pdfIn PDF document text
    • http://winoraama.site/sports_coaching_psychology_definitionedfui.pdfIn PDF document text
    • http://scm03.ru/nasty_goats_gamep2at4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001a434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A434 5304 bytes
SHA-256: 20d0d5c0dcff5880d4449c8e4809b1711d36031922c6130fb8e6101f03d19091
font_01_sfnt_off0001b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B633 10372 bytes
SHA-256: 734a3238b691dde6749ced8a8d226e8ac7eff8cf14be161e6ad9252ef51fc4d1

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