Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b747a35d8de4577…

MALICIOUS

PDF

85.3 KB Created: 2021-03-06 07:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dbf0cec824690461c2c7d5171255a0fd SHA-1: 5966bf6970d9d2461b28c58f5d1454f4569b5cd2 SHA-256: 6b747a35d8de4577d8792e99b4cbd31d09355516e531b0309b638e330656fdfc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and likely part of a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary URL suggesting a lure related to a scientific query. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=how+to+find+number+of+atoms+in+one+molecule PDF link annotation
    • https://cdn.sqhk.co/joxesinejag/JPihFS8/rumble_in_the_bronx_netflix.pdfIn PDF document text
    • http://texukajiz.iblogger.org/40441335299.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/hjcjgov/34132671395.pdfIn PDF document text
    • http://olymp-trade.top/calligraphy_lessons_for_beginnersww8tk.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetozativ/Ao7jdha/war_of_thrones_band.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/ie3jejg/zemalijiwelenabanulugabed.pdfIn PDF document text
    • http://akfb.online/550118256929mxkp.pdfIn PDF document text
    • http://itsamorem.com/67036829812q8cly.pdfIn PDF document text
    • http://robot3.site/curreny_weekend_at_bernies_zip3fwdg.pdfIn PDF document text
    • http://kogiwonewaveg.iblogger.org/1968820982.pdfIn PDF document text
    • http://trokot-tonirovka.online/thermax_absorption_chiller_manual0q5og.pdfIn PDF document text
    • https://cdn.sqhk.co/xomakonezema/foXWq0Y/62497362581.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://furunes.onlinewebshop.net/56376890260.pdfIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_2a057a5128d4498f8b4da955219a5a25.pdf?index=trueIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_4934e20c236d429ab565096ad6ba7ab8.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_ca76b4203b164590a5b00e7f83ca67a7.pdf?index=trueIn PDF document text
    • http://xekurenu.rf.gd/98308889648.pdfIn PDF document text
    • http://kopolug.myartsonline.com/wifebokipozosulopas.pdfIn PDF document text
    • http://nepopujadulipid.epizy.com/zusutumexokuritoneve.pdfIn PDF document text
    • http://puribisipup.atwebpages.com/ferugut.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_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 5360 bytes
SHA-256: 8c4b791b4d0f87246e219540a55e92428d91de4553f68d9891c735d55074851b
font_01_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 11164 bytes
SHA-256: d7398afc403e803106bd3a423d926c82a46210630588e2438cd6ae98e20ad16b

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