Malicious PDF — malware analysis report

Static analysis result for SHA-256 698d38742e12582c…

MALICIOUS

PDF

84.3 KB Created: 2021-04-02 13:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dab48c1d58abb84a67d22ada76c14b0 SHA-1: 9ff2946d82f6bbff49fad5946f2306320e871f7e SHA-256: 698d38742e12582c646705d69b695e2fdcd5cec317627e4e2c8c34ec5f7ecbd1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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 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://lozipotod.ru/123?utm_term=suzuki+bandit+600+service+manual+free
    • https://cdn-cms.f-static.net/uploads/4418367/normal_6038fd2dcbed6.pdf
    • http://jarewitof.mypressonline.com/16194398832.pdf
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/vujuf.pdf
    • https://kozoniwapi.weebly.com/uploads/1/3/4/0/134016697/lopudibusube-jofilanutelex.pdf
    • http://bewizasosu.sportsontheweb.net/how_to_draw_really_cute_anime_eyes.pdf
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fe358bb83794.pdf
    • http://rolopigabetitu.scienceontheweb.net/runaxadolonutibez.pdf
    • http://fodibuj.scienceontheweb.net/edible_oil_industry_in_pakistan_2020.pdf
    • https://denafeferigo.weebly.com/uploads/1/3/0/8/130874231/f85f84fd13.pdf
    • https://nitomono.weebly.com/uploads/1/3/1/4/131454496/8905085.pdf
    • https://cdn-cms.f-static.net/uploads/4473052/normal_6057fcc12188d.pdf
    • https://cdn-cms.f-static.net/uploads/4475728/normal_602e6170dd167.pdf
    • https://xolijusir.weebly.com/uploads/1/3/4/0/134016651/76e0f0334.pdf
    • http://rofogukiluvupu.mygamesonline.org/mipezegolud.pdf
    • http://zotikarida.medianewsonline.com/rekugakuxovubasetot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_71f2214711c84c368c30c9b87c693e26.pdf?index=true
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_448f254ea5944a2987cd43e1642c8fcd.pdf?index=true
    • http://kitilogokufalu.atwebpages.com/car_aerodynamics_explained.pdf
    • http://sifebitufol.onlinewebshop.net/annals_of_probability.pdf
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_5821edac0019434bb4d788950baeebfa.pdf?index=true
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_7336448cea8a474b897885697913509a.pdf?index=true
    • https://6dd05bf8-a32e-4ce7-8057-9a1894012cff.filesusr.com/ugd/4ce960_06abcec62c0f449b81567ed7f0715513.pdf?index=true
    • 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_off0001026f.bin
7fcbb4dd2d086ce8ef83f9114a961081c2059263ac2249eb64a1c9b2d4673557		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 5880 bytes
font_01_sfnt_off0001166d.bin
c261bf5dc5ba65c40a61a301930e4e9564e09b3d6644fe5dac1758fd534f690e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 14808 bytes

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