Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8324f3a7838dc1c…

MALICIOUS

PDF

67.4 KB Created: 2020-11-11 05:05:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ff45d8d55761d83f2b5f7ef888c2e76d SHA-1: 09f6f1e2c87a50a5d1e4ad9ee5f81fd5399cbd54 SHA-256: b8324f3a7838dc1cb03666ca4cef6408305280947cf2a5ae33c2b2549112155c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of redirecting users to potentially malicious content, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?keyword=talking+tom+gold+run+apk+mod+android+1 PDF link annotation
    • https://gesoroserazam.weebly.com/uploads/1/3/4/3/134310447/litirololabozabuli.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xereromejiv-koxozirusoror-moxonujis.pdfIn PDF document text
    • https://duvibebo.weebly.com/uploads/1/3/4/3/134375256/kopoxe_zafupevevof.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/voximaj.pdfIn PDF document text
    • https://dujenavu.weebly.com/uploads/1/3/4/3/134366251/9dc697576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_5f9e47f7421a8.pdfIn PDF document text
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/lapekogisibi.pdfIn PDF document text
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/rogize.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_5fa334168ecae.pdfIn PDF document text
    • https://nowusunomotir.weebly.com/uploads/1/3/4/3/134314498/zudujowan.pdfIn PDF document text
    • https://pexegiwu.weebly.com/uploads/1/3/4/5/134526087/fukevigaxu.pdfIn PDF document text
    • https://belonimilulufaf.weebly.com/uploads/1/3/4/4/134403367/kekelofimekiti.pdfIn PDF document text
    • https://butebipibib.weebly.com/uploads/1/3/4/2/134265815/170837.pdfIn PDF document text
    • https://lafawifovetin.weebly.com/uploads/1/3/4/3/134369932/8249675.pdfIn PDF document text
    • https://fabodafulunulof.weebly.com/uploads/1/3/4/3/134372089/1384644.pdfIn PDF document text
    • https://merasewutid.weebly.com/uploads/1/3/4/3/134348660/d67a4abd0522868.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/48f408cb-325d-40ab-8a1e-87b975c021ab/vekugoxopekel.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_off0000caf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF8 5164 bytes
SHA-256: 4c65c5d5b64f5968376a331593246e46791f0be0bcb0923e4f0f7b566aeb44d7
font_01_sfnt_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 10644 bytes
SHA-256: f622347166bd30aeb2707d0e1abe65deb45d031fd2757f13b9048ec03b750731

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