Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29f100ccd195ec8…

MALICIOUS

PDF

76.2 KB Created: 2021-03-23 00:56:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1292b094084e075bfe2799f03fca7ab SHA-1: 76a5dc6f7e9a9a3f80fe74f630a0b3b7cfdf80c1 SHA-256: b29f100ccd195ec8bc2c7db8442ae6112549adf1aba0f1a91ae4006e9b7f5230
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The embedded URLs, such as http://vitonidero.medianewsonline.com/koziziwamanorun.pdf, are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=free+binder+cover+templates+for+business
    • http://vitonidero.medianewsonline.com/koziziwamanorun.pdf
    • http://pugisapi.mypressonline.com/elementary_linear_algebra_10th_edition_solutions_slader.pdf
    • https://wuriwodek.weebly.com/uploads/1/3/4/6/134688082/poxuxevunotob_jasopabad_jibidagil.pdf
    • https://static.s123-cdn-static.com/uploads/4417145/normal_5fe3e7223cff7.pdf
    • https://xadidevoki.weebly.com/uploads/1/3/0/8/130873902/8137529.pdf
    • https://static.s123-cdn-static.com/uploads/4367294/normal_5ff6aa0cc6a64.pdf
    • https://feriwixuwegixuf.weebly.com/uploads/1/3/4/6/134602873/207006.pdf
    • https://cdn-cms.f-static.net/uploads/4445736/normal_601abe70989d0.pdf
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/a5a82.pdf
    • https://jusodizepo.weebly.com/uploads/1/3/1/0/131070216/kosivumutafu.pdf
    • http://subuxiwubemew.getenjoyment.net/40207754031.pdf
    • https://cdn-cms.f-static.net/uploads/4409806/normal_600bbe2e99b85.pdf
    • https://bojibelatos.weebly.com/uploads/1/3/4/0/134040608/rugefodem_sovele.pdf
    • https://buxodofuluni.weebly.com/uploads/1/3/4/8/134875319/777476.pdf
    • https://viwoxewadekam.weebly.com/uploads/1/3/4/0/134016770/vepitupe-rufajumol-bimefov-luvofimowesosa.pdf
    • https://sitimewodojex.weebly.com/uploads/1/3/1/8/131856527/rozexojafoxokefelim.pdf
    • http://saduzemed.mypressonline.com/15210031104.pdf
    • http://rarubife.mygamesonline.org/astral_travel_for_beginners.pdf
    • https://kusazejur.weebly.com/uploads/1/3/1/4/131437880/ec571d79e024a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wegemebufojafak/63415002787.pdf
    • https://s3.amazonaws.com/wunojipu/30141783139.pdf
    • https://s3.amazonaws.com/wujapu/33497747665.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_off0000ede5.bin
b7df85224b3814ac93d7ced7fbe37b3ed6c7f3b6442bcca0cd1185eb1da4a855		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 5456 bytes
font_01_sfnt_off0001005e.bin
8448c32c0fa48f44415f0ff9006959ec7f1c0593d5e8c0c5ea6b089148d42920		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 10240 bytes

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