Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7959f624981379…

MALICIOUS

PDF

82.3 KB Created: 2021-04-25 19:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 354a316366228baef3a858295b02ace1 SHA-1: 59894bd20426982515de91aef4cdfaea0a0ee90c SHA-256: 8f7959f6249813795ed17ad77aa1875933bc3400965afd4bbb356221ed5c3f6c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://maypoin.ru/strik?utm_term=karma+bhagavad+gita+quotes+in+kannada+language PDF link annotation
    • http://sibatike.getenjoyment.net/nopiziniteredavovipipobu.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/various_definitions_of_language.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/brazil_history.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/larezonaji.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvuzebilet/3jcgjPH/picsay_photo_editor_apk.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/vesanaravulevesofozegiwo.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/bukuremamowizuvubapu.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/5343452.pdfIn PDF document text
    • https://cdn.sqhk.co/lalamiteliw/jcgcieY/53751376001.pdfIn PDF document text
    • http://1xbet-registr.site/best_video_recording_software_androidrrey8.pdfIn PDF document text
    • http://notdull-eng.online/nofemumepubidomaa8cm9.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/b1iiiNU/bandicam_free_download_softonic.pdfIn PDF document text
    • https://cdn.sqhk.co/woferomot/exghR9t/55331585788.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/ifhggjy/44730427311.pdfIn PDF document text
    • https://cdn.sqhk.co/rilowikapaz/hfTlhjp/xowegukadojawopudipu.pdfIn PDF document text
    • https://cdn.sqhk.co/bozogekeji/ePPgd1X/vabodetitufolinatobusi.pdfIn PDF document text
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/buxazaforabeke_xisamanuwepebo_retoxuk.pdfIn PDF document text
    • https://cdn.sqhk.co/rovonoset/ifdoLLW/63183305002.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pofijiserige.onlinewebshop.net/17913007996.pdfIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/naxopefu.pdfIn PDF document text
    • http://pedamodaw.onlinewebshop.net/what_is_share_market_and_how_it_works.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f97c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF97C 3284 bytes
SHA-256: f1c4ef000bddb1441600dc43f554e3471eaf12567b952708726a5bab6902e69e
font_00_sfnt_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 5600 bytes
SHA-256: 5903bdfe9b230b55c925607457d1ec5969460c568ed19b46952fb1801e68c402
font_02_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 11668 bytes
SHA-256: e57a17e80ed210ec53f38aa887d468c4b53b5d2387aebc78ee7a67b82cb83941
font_03_sfnt_off00012c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C01 3868 bytes
SHA-256: 3c38c2e2525be9c8c7732e93d5b88c409f27816d8061c51a287e31adcba40f7a