Malicious PDF — malware analysis report

Static analysis result for SHA-256 655fe6280d31629e…

MALICIOUS

PDF

72.8 KB Created: 2021-01-17 15:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 005a12c43365f9823684c2e11c745d32 SHA-1: bd5f865054b0e56ad88e4c93517c965ec8c1806c SHA-256: 655fe6280d31629e9715ab078d018e6f61556e2ffb5afb1445aff3770bc2fc6b
244 Risk Score

Malware Insights

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

The sample is a PDF document flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, many pointing to disposable hosting services, indicating a link farm or phishing attempt. One critical heuristic identified a link to known malicious redirector infrastructure, further supporting a malicious intent.

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
  • 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://traffking.ru/aws?utm_term=equilibrium+constant+of+fescn2+lab+report In PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/8876484.pdfIn PDF document text
    • https://site-1197316.mozfiles.com/files/1197316/kaiser_permanente_provider_login.pdfIn PDF document text
    • https://site-1178898.mozfiles.com/files/1178898/72480773114.pdfIn PDF document text
    • https://pakimisubimoge.weebly.com/uploads/1/3/0/7/130776027/xawuwox.pdfIn PDF document text
    • https://site-1171568.mozfiles.com/files/1171568/63353627329.pdfIn PDF document text
    • https://putoxovomugov.weebly.com/uploads/1/3/0/7/130739063/gotutunibu.pdfIn PDF document text
    • https://cdn.sqhk.co/tizudukokeni/0pTXgdN/mini_dachshund_puppies.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/c9b01c.pdfIn PDF document text
    • https://site-1172371.mozfiles.com/files/1172371/sepitalolubafirej.pdfIn PDF document text
    • https://fobabunopana.weebly.com/uploads/1/3/0/9/130969757/tuwopoka-nowusesubugef-zewijeguzopodol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380674/normal_5fe3405268422.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459469/normal_5fce8a9a653a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gapivegek/axolotl_english.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/cuneiform_bone_definition_anatomy.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/70404461184.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_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 5516 bytes
SHA-256: b45ce9e7c78ffa3b4146ebacb0b146c5a1326b3412df82986e6c699affae225c
font_01_sfnt_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 11144 bytes
SHA-256: 5da3244ed48c80564c41d81afae2b4f3a563390d24d45428675932c8fca94bcb

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