Malicious PDF — malware analysis report

Static analysis result for SHA-256 6707eae972c255d5…

MALICIOUS

PDF

77.5 KB Created: 2021-03-25 08:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 95ed292710c10d1a2616689aee88c77a SHA-1: ee929f9051be3bb9cda986845f63292aac7efaf3 SHA-256: 6707eae972c255d535dc61e9f14f48a24978d4cf63f1c2c5de5331a5e8858c76
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://crophysi.ru/wix?keyword=about+the+author+examples+for+high+school+students PDF link annotation
    • https://dojobojijiwum.weebly.com/uploads/1/3/2/6/132681334/zirolivatib.pdfIn PDF document text
    • https://fumunagik.weebly.com/uploads/1/3/4/5/134520136/3f8c2.pdfIn PDF document text
    • https://xaporavuxeboj.weebly.com/uploads/1/3/2/6/132695407/019195d69ab78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_60292c85b510b.pdfIn PDF document text
    • https://cdn.sqhk.co/naketego/hcYjijg/new_bike_hero_xtreme.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/jjjcNhh/maderok.pdfIn PDF document text
    • https://cdn.sqhk.co/kagitenoru/fjiieBM/joxenozozukugepaweko.pdfIn PDF document text
    • https://cdn.sqhk.co/vivejegefonu/hgwDifP/format_meaning_in_gujarati.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/ihej6ig/buzzer_sound_button_app.pdfIn PDF document text
    • https://nunuwipan.weebly.com/uploads/1/3/6/0/136002942/8370297.pdfIn PDF document text
    • https://guzejanum.weebly.com/uploads/1/3/4/6/134681017/levebebikufe.pdfIn PDF document text
    • https://cdn.sqhk.co/tisezalave/Bicgjfd/moxanivoxos.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerusesebu/jjhjRji/risisefogeziwemasa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413705/normal_6007532f18b65.pdfIn PDF document text
    • https://cdn.sqhk.co/gederanew/htgdgjy/chicken_drumstick_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5038530e-d75f-42a4-864c-9c170e9f661d/29940851456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8587b2-8e67-4746-bf69-ef5d8f37585d/7.3_powerstroke_engine_layout.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_c1b4554cb5fc486799a707aab5146b27.pdf?index=trueIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_fd9e91c541e74a7cb5c3d436ce15bcde.pdf?index=trueIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_e0aab386f272486ab12d99cce1d42de8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/887a39e2-8186-4559-8117-47f51ae3a076/81596249710.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_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 5764 bytes
SHA-256: 9fac4beaff7e976a18ce5ac14edc0c16cca2d7841694280e2ee212c8a5cf3254
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 10928 bytes
SHA-256: ea1f368c5b6c0084b9a9ceea4ea401f64578ee7991e9651237908aadd63b5fe5

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