Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78034c31beb5d50…

MALICIOUS

PDF

40.1 KB Created: 2020-11-07 18:12:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 838901830d842cfe561807a9839a3b05 SHA-1: c9f7ed6edb0b2d82e5fc58855926d1cf1640ca01 SHA-256: e78034c31beb5d50beb316b4f486aed35b6927c7f6129da69523fe3b1405f4ee
146 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://traffset.ru/aws?keyword=arp+isd+home PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448536/normal_5f9e20b881edf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_5f94c094c167e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_5fa42583e6d94.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/zakejudipuvebomaw.pdfIn PDF document text
    • https://fokakumunimu.weebly.com/uploads/1/3/4/2/134266115/4092517.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jasobegofur.files.wordpress.com/2020/11/42017746306.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/rabun_county_high_school.pdfIn PDF document text
    • https://kopuvavir.files.wordpress.com/2020/11/rocket_propulsion_derivation_class_11.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/merozasopegujibe.pdfIn PDF document text
    • https://zaninudazune.files.wordpress.com/2020/11/jexunekazesixikupatapuzuw.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_off00005dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DFC 4948 bytes
SHA-256: c18c1bc91eb7eeddb9c9cb74ca5b88a1a3c9fb951596559b75f31d4d4e4f2ff3
font_01_sfnt_off00006ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA6 11324 bytes
SHA-256: 30e324c6b8fd2eb07d41558cdbefe95137f26f57d8190af27ca24eb2c4870ba7