Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1645c5356b526b…

MALICIOUS

PDF

69.0 KB Created: 2021-01-04 21:37:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd50f80991c89cda7623226bc899a5b0 SHA-1: b227079df1c4338ea1288ab0b83925dfb9b710b0 SHA-256: 7a1645c5356b526b22df97adf74c935724c20822c29852e7e8f155dc481dee66
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/aws?utm_term=berlin+sans+fb+font+free
    • https://cdn-cms.f-static.net/uploads/4365575/normal_5f8805e92d693.pdf
    • https://cdn-cms.f-static.net/uploads/4418188/normal_5f9ccd5190eb8.pdf
    • https://cdn-cms.f-static.net/uploads/4476275/normal_5fa7654be455b.pdf
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f8c4a836bd71.pdf
    • https://cdn-cms.f-static.net/uploads/4446645/normal_5fc1d7427f520.pdf
    • https://pilitopamazi.weebly.com/uploads/1/3/4/3/134313639/9768972.pdf
    • https://wibawewema.weebly.com/uploads/1/3/1/3/131398479/gutanuri.pdf
    • https://static.s123-cdn-static.com/uploads/4485714/normal_5fde8f840cd59.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4e1e3c4f-0bbe-470c-ac2e-3b56faa81adc/96953776043.pdf
    • https://uploads.strikinglycdn.com/files/53fccbbd-4811-42f0-9061-e3f8285dbbb9/48662916891.pdf
    • https://s3.amazonaws.com/jipowumat/cold_or_hot_rolled_sheet_metal.pdf
    • https://s3.amazonaws.com/tumasun/92108135418.pdf
    • https://uploads.strikinglycdn.com/files/8c4c222d-2e8e-410c-8e59-cb464da2829e/76400220641.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d075.bin
516bcf1191b0f863037dbb7df3432145d5a3b8cc5b56c0bbf55d5bfb0e1ca871
pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 4952 bytes
font_01_sfnt_off0000e15a.bin
b0f79814134a4879292148b75cc208d787762b9312ee6ac3d524ebf434327a96
pdf-font-stream PDF embedded font (sfnt) at offset 0xE15A 11668 bytes