Malicious PDF — malware analysis report

Static analysis result for SHA-256 3970a38dc337dc1b…

MALICIOUS

PDF

86.5 KB Created: 2021-02-18 01:19:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 93007a68cc26b55a014bf357d736b555 SHA-1: dd63b37018e0af4e675e5e5bda4cdb97c3a07945 SHA-256: 3970a38dc337dc1b90c846f7ccebd14482f7e9eac866cf08d88b13f24c6b0a99
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a significant number pointing to disposable domains and employing UTM parameters, indicating a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to redirect the user to a malicious site. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jottigo.ru/strik?utm_term=genesis+6+1+8+explained PDF link annotation
    • http://doucheapp.xyz/border_design_png_vectorvuzi0.pdfIn PDF document text
    • http://bibotabelik.22web.org/potuwikebaruvubovep.pdfIn PDF document text
    • http://4gusevshop.space/statistical_methods_for_speech_recognitionxd8di.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419003/normal_6010cf8b3ca95.pdfIn PDF document text
    • https://paxolobiwoke.weebly.com/uploads/1/3/1/1/131163878/d5fabb54ee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486353/normal_600bd5d1317f9.pdfIn PDF document text
    • https://nububoreral.weebly.com/uploads/1/3/4/4/134467099/6480174967d.pdfIn PDF document text
    • http://powerpoint4you.ru/vitamin_b12_is_supplied_almost_entirely_byq4wx3.pdfIn PDF document text
    • http://remont-kholodilnikov.website/bovirokitezovebafuzorogew8z3gi.pdfIn PDF document text
    • http://levupag.22web.org/63841507525.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/kovozenamofox/goblin_engineering_vanilla_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/total_plate_count_and_total_coliforms.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/petty_cash_template_printable.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_off000116a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A8 5356 bytes
SHA-256: d57578698e41e87518711ed78525a8c92537a77e37153ad89a664baa419dba0d
font_01_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 10536 bytes
SHA-256: 496b593dd6072bc1bcd6f68526adb9c1a2f265fbd4a08bd25cdf61e3779e59ab

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