Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35f5ceb0fcacc09…

MALICIOUS

PDF

78.0 KB Created: 2021-05-10 00:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 350907f4675e076a100820d3a781863d SHA-1: 0da3c3fca226ddd6366014a2f5f6fcef21223906 SHA-256: b35f5ceb0fcacc099a5048709aadc1942e9dd4a666fc00145a61f962af0fbe04
146 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. The presence of numerous external URIs, many on disposable hosting, suggests a link farm or phishing attempt. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or tech-support scam pretext. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to malicious sites.

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://golowaki.ru/strik?utm_term=taurus+g2c+compact+9mm+review PDF link annotation
    • http://shop-profildoors.ru/759273758379hd0k.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/pagutegunezalagojime.pdfIn PDF document text
    • http://naturka.space/ralitaramukixozub0m8d.pdfIn PDF document text
    • http://becloud.website/how_to_make_gluten_free_sourdough_bread_in_a_bread_machine7x1r1.pdfIn PDF document text
    • http://kartaidatodemeleri.com/tikumura7zpye.pdfIn PDF document text
    • https://latapelubatute.weebly.com/uploads/1/3/5/9/135960370/fikegulovigaxosene.pdfIn PDF document text
    • http://hs-life.ru/18742240618stdh1.pdfIn PDF document text
    • http://gikepofazanapol.mypressonline.com/vexuliwedezavoru.pdfIn PDF document text
    • http://ukranews.site/lingo_the_word_gamert53mb.pdfIn PDF document text
    • https://topepixifugop.weebly.com/uploads/1/3/4/3/134322533/mefutazu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_0e01d7636c044f6daa03eb659e33fe8d.pdf?index=trueIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_3f939552076f4f42933ad42354e270ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0abf129-6276-48db-b1f1-bb06018b9476/94186597418.pdfIn PDF document text
    • http://movuzawizigevej.myartsonline.com/bimivukovu.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/referat_abortus_inkomplit.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_2e23dcb5089f40fab5212962958ab81f.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_9e4840441c8c41cbb6198c08413c016f.pdf?index=trueIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_5d03da404e054689ba7e9f28761e562f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c724f5a-19a1-45fa-b91b-10c60d032374/linking_words_list_for_ielts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/947661c8-40d2-4e86-a2e5-d09f9fa8cf3b/domijewufirexixuwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2876f0-bff3-4798-9c91-7d72d3c4cb78/52258787575.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_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 5608 bytes
SHA-256: 439c6fb7c1a464d71753366f944159f90647ae6a7834aeb8f9015f3d1e17254e
font_01_sfnt_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 11792 bytes
SHA-256: 302fd27484064cf30c676dc9d483a33afa55472e0b19c245cb066bf1b4ff2db3