Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f900abe3e2990c…

MALICIOUS

PDF

83.6 KB Created: 2021-02-23 11:45:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 82078949815069a1a39d0b6b31e353f1 SHA-1: b87b53ac3047fbc8752f0898102b13fdf79eb61f SHA-256: 10f900abe3e2990c986031a76c45f584746660ed31de01dd849f7ca450383d62
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to 'practice b point slope form answer key', directing users to external URLs like 'https://baarspo.ru/wix?keyword=practice+b+point+slope+form+answer+key'. No scripts were extracted, but the PDF structure and numerous external links are indicative of malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/wix?keyword=practice+b+point+slope+form+answer+key PDF link annotation
    • https://cdn.sqhk.co/rurizibaxami/k8bgcgf/nox_emulator_ark_survival_evolved.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_6021e9156154a.pdfIn PDF document text
    • https://cdn.sqhk.co/sesudegaruta/gcPOib2/tree_dollar_careers.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/jaH57TG/27963050594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_601995c2d4b9d.pdfIn PDF document text
    • http://jebuzakawug.iblogger.org/45500190740.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445869/normal_5fee3abacf6b5.pdfIn PDF document text
    • https://cdn.sqhk.co/gujadozede/jdhdjbs/39313260875.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/gYe1ggd/fighting_tiger_liberal.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/3315612.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sivisalatifaba.rf.gd/70091967002.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/chevy_cruze_2016_user_manual.pdfIn PDF document text
    • http://waxozex.epizy.com/comments_for_pre_school_report_cards.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/chu_chu_tv_poem_free_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/kifodigosagefowagavebawu.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/26926786320.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/96949939512.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_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 5560 bytes
SHA-256: 2c929d630251547aef30242118718a4d3a5cf849c5f502b8646bfa3b052d6ae5
font_01_sfnt_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 11520 bytes
SHA-256: 1c9baf2253412f0f58295d3a6f59a4f11682d02add5e30693d1857f483bf802e

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