Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a6796a13f73828…

MALICIOUS

PDF

80.7 KB Created: 2021-02-24 12:59:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e92c848e4b67bdadaf63026f095b2ded SHA-1: 79a667a5eb7e739c94090a0a87a9546315646fda SHA-256: c4a6796a13f7382887613a155ff3437da4e7417f74b4a2de4cbce133f35294ff
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://jacksth.ru/wix?keyword=pepp+test+study+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417313/normal_5fc9ffae8f991.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzalolotagi/uiaYkF7/55258713476.pdfIn PDF document text
    • http://creditpm.com/521764289576ptyp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458163/normal_601481447d84b.pdfIn PDF document text
    • http://dresdenpharma.ru/how_to_do_java_programming_in_windows_10t1wam.pdfIn PDF document text
    • http://top-salez.site/defense_game_pc_freeuyqpf.pdfIn PDF document text
    • http://chempion.coffee/important_genetic_disorders_worksheet_answer_keyvopcj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424933/normal_5fd15f299c307.pdfIn PDF document text
    • http://ru-order-687646765445.art/347084508495yygx.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebapenuj/ij14tgg/narowusudulawuxofe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494657/normal_5ff247f2c55ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_6011075984c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452862/normal_60293ddee5dac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_5fd9f45a22193.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477387/normal_5fcabdd9ed348.pdfIn PDF document text
    • http://kismykeitio.best/45035719126zfp26.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 4560 bytes
SHA-256: 62a527fac237d691a43ae13ccfeca718f3303c4d298628e5bf0a9d4bccbc7dfd
font_01_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 10760 bytes
SHA-256: f2b81360ce90de11a297f4bf1ff6c2229daa2ed78d0f1ecc9988bec9950a2bad
font_02_sfnt_off00012733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12733 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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