Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19b4eb1dddee697…

MALICIOUS

PDF

80.8 KB Created: 2021-05-29 08:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 44766a75a8d26a957ccf4bb2c76f609e SHA-1: ed8c3732eddb2f0bb170bf63283adba4667c9c3b SHA-256: a19b4eb1dddee6979e1d68b0c3980206a513c79c9ce621473757d76d48f4b96e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple critical heuristics as a malicious redirector and a link farm. It contains numerous embedded URLs, with at least one pointing to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=why+do+i+have+crazy+dreams+when+pregnant In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476782/normal_601493a452f7a.pdfIn PDF document text
    • https://sotinele.weebly.com/uploads/1/3/4/6/134640455/9067650.pdfIn PDF document text
    • https://bizidijekivaza.weebly.com/uploads/1/3/4/5/134502856/aabba9a0d0f6.pdfIn PDF document text
    • https://zebaraxofalolal.weebly.com/uploads/1/3/0/8/130813897/3607827.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5fcc911222fe1.pdfIn PDF document text
    • https://xazefobilizap.weebly.com/uploads/1/3/1/3/131384081/8f86ea.pdfIn PDF document text
    • https://rapagifetudi.weebly.com/uploads/1/3/2/6/132682686/luboneja.pdfIn PDF document text
    • https://nepujegoxamo.weebly.com/uploads/1/3/4/3/134380276/80fb51.pdfIn PDF document text
    • https://dowikonusinewe.weebly.com/uploads/1/3/4/3/134374018/wevazigisum_pokezafomasori_pemedorifoxa.pdfIn PDF document text
    • https://nejuxudukekiti.weebly.com/uploads/1/3/0/8/130874136/zopinituxifu-biliv-boxeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb80d64-82a1-4cfa-992d-63ff38640442/46004447095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65795502-9ea4-4e90-9d02-44694800b680/26955532651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c3cb16-fc77-476e-8598-bf9ffa066c12/36350116372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3392b1f-b758-42cc-b845-9e216555d639/78178487327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b5fade-09ef-4355-b131-f3f4dcd1e287/how_to_prepare_a_10_minute_presentation_for_an_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f68dfd7-5eb9-45ab-95cc-71af5734c9aa/tumalajimufupeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f703e7-f741-41a7-8bfd-b0a502bbcd4f/how_to_prevent_dvt_during_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4708a5eb-090b-4365-b8b7-dbd633b2ecaf/78552856735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3738de36-68f0-4ac4-9f42-5862e11a7613/66809385984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dc2bf6d-8340-45fa-915e-c7777a973c22/dajejutadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14549b18-faf3-475d-9dd6-3b7a5f91fb86/finding_forrester_comprehension_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6417891-0c3f-42ec-a4ac-8c70881f3873/how_do_you_know_when_to_harvest_your_lettuce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cfb9f22-ac65-4f41-9547-839206322835/foxake.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_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 5772 bytes
SHA-256: fbf37e5887282fc810abbeebe09485aad27bade09c100794e53a17d4a50a9147
font_01_sfnt_off000111fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 10484 bytes
SHA-256: 6656c5b32a82601427f48edd452baf425748df7c452a54a756510032e94cfb6c