Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce7ac7457a0de672…

MALICIOUS

PDF

64.1 KB Created: 2020-12-22 05:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4414db0d815bff04939230f1a10da432 SHA-1: 97044d27e86ccd70b92d0b4f13b06d06633be5c0 SHA-256: ce7ac7457a0de672d5bb4c8213851d3100f5e9b501bfa0934b5dac482bfe2e02
156 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, identified as a PDF link farm. One of the primary external URLs is trafffe.ru, which is suspicious. ClamAV also detected this file as Pdf.Phishing.Trojan, indicating a phishing or malicious intent. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=psvr+lens+cleaner PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fdae3f9087b5.pdfIn PDF document text
    • https://fedoxamanisoru.weebly.com/uploads/1/3/4/6/134668372/loxugezisilixo-wodeboxu-tedikosekamu-nodaxelugiterof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_5fa25af9307ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444357/normal_5fa2f1ca45fac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408589/normal_5faeab1d67065.pdfIn PDF document text
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/latolopalajesexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468827/normal_5fa94f0fe0c36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc58e295687f52b6ba0bfae/t/5fc7ad3a5060c93fcd85e181/1606921530771/beteviwep.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc53afda3bf4b14abc57bb9/t/5fc745cf56cd4459b3b57a0f/1606895057740/fowekosigogapoze.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5a336ea4a794d5665861d/t/5fd6190b226e9048faadb4e0/1607866636340/advance_rx_prior_authorization_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e99fa13a450babf41659/t/5fc326b46457125654a35dc8/1606624949247/rixedewolo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1651bc89e1c4b8fc1e357/t/5fc2bd98f3de5e49b5be91ef/1606598040337/does_flying_provoke_opportunity_attacks_5e.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc111b5ff13940aa240a14e/t/5fd184d71693665fc7c9eee8/1607566556056/nabegitew.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc297e6df132613bbc87a99/t/5fcf9cea01eaf4591e30f6ca/1607441644494/where_to_buy_finger_basketball_games.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc013a70a2757459bde56bb/t/5fc0f5fc2dd96f591811c2a7/1606481406083/wipibasezol.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_off0000c092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC092 4856 bytes
SHA-256: dfc111232de913bf1f44665f3c37d965adeb18415cbe8e9c50703c5dafbbd603
font_01_sfnt_off0000d129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD129 10188 bytes
SHA-256: 81ff2b8b8b8d39a7c335422c653f482afafe959ef0091f00d728f332df4a87a4

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