Malicious PDF — malware analysis report

Static analysis result for SHA-256 989b689ce87e3aa2…

MALICIOUS

PDF

75.4 KB Created: 2021-03-11 14:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3da4dd4a4a0c15919379ec65ca1f7e62 SHA-1: bb3d18fcbfbd4d1134c915c7b5cc3d4312cf6933 SHA-256: 989b689ce87e3aa27255987353bba926d3f3f01662355f87c8182af6c886806a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one specifically pointing to a suspicious domain ('vilenefex.ru') disguised as an interview preparation document. ClamAV and ML classifiers indicate malicious content, specifically a phishing trojan. The presence of embedded links and the overall structure suggest an attempt to redirect users to a malicious site for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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.
  • 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://vilenefex.ru/123?utm_term=interview+english+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419654/normal_602b7f6d4c273.pdfIn PDF document text
    • https://feropozu.weebly.com/uploads/1/3/1/4/131454035/5259fa27e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5fe41fb7474d1.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/kLihija/lugajanosuxowelojitip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412183/normal_5ff3eccd309d7.pdfIn PDF document text
    • https://cdn.sqhk.co/jexozumumanu/idyjin2/world_of_darkness_solo_ffxiv.pdfIn PDF document text
    • https://gelowoxolup.weebly.com/uploads/1/3/4/7/134703814/ruwowetanal.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/NohjIic/43557324675.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/momelufutujako_powusarami.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/Giiidd9/63361790977.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/yNfigjd/8831954854.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/zevutebulaworel/61777041074.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/christian_answer_to_trolley_problem.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/rusunilapakufeje.pdfIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_610d0a828b06485eafed4cc4289db88c.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_c2f37a97c756459984788e8879a7b6bc.pdf?index=trueIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_5baf14ee5afe44aca6d4f2771fe97351.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/29343446892.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/anticipatory_bail_application_format_in_high_court.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/62941533502.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/kopeja.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/commoncoresheets_rounding_word_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/6759502371.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 5184 bytes
SHA-256: 4c0cc2b8bd7b2694ca392ec0ed3bd72a48305d59e0ea5132cb4a8335d3b4716d
font_01_sfnt_off0000fb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8E 10792 bytes
SHA-256: ebc3e1512b9c7f37f04c5d64db32ab83474f9fecb80c668903622352208e15e5

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