Malicious PDF — malware analysis report

Static analysis result for SHA-256 839aad65a2a1a3b3…

MALICIOUS

PDF

81.5 KB Created: 2021-03-28 13:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 974d7568c9b29d74e4a9b1274947ca1a SHA-1: e397ded675f0f371974284b0257db2a4eee0bff0 SHA-256: 839aad65a2a1a3b34f8697bc10ba9dfe86e4c7a177bfa7c87825c7a9cec2181b
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 0.9996

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 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://botokaw.ru/award?keyword=genetic+causes+of+obesity+pdf PDF link annotation
    • http://upgrade4me.com/8631364658114ut3.pdfIn PDF document text
    • https://cdn.sqhk.co/gatezoru/XVibSgj/medejoduvuwab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445864/normal_602d8b9768467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460446/normal_5feecb915522c.pdfIn PDF document text
    • http://fb-copyright-help-from.com/vezuvilezikasw3lxz.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/gKie45J/mortal_kombat_x_how_to_unlock_kitana_costumes.pdfIn PDF document text
    • http://migerov.xyz/excel_format_cell_first_letter_capitaltw9de.pdfIn PDF document text
    • http://vewazovowev.iblogger.org/2333952960.pdfIn PDF document text
    • https://xakebugus.weebly.com/uploads/1/3/4/0/134018628/8a19f364979b2ce.pdfIn PDF document text
    • https://bofeliwibetu.weebly.com/uploads/1/3/2/8/132814086/a1ff879.pdfIn PDF document text
    • https://kimuximufa.weebly.com/uploads/1/3/4/1/134132687/gowirugafam-fipewexasomesa.pdfIn PDF document text
    • http://civiliscmq.online/pro_call_blocker_ct-cid803_plus6a4gy.pdfIn PDF document text
    • http://harkateine.fun/9703170871qq6h9.pdfIn PDF document text
    • https://wowumufugijakig.weebly.com/uploads/1/3/0/9/130969685/tanakijuxabulox.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/Fjfjdia/bubble_tea_recipe_without_tapioca_pearls.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/8vqgrjd/army_clash_mod_apk_2._4.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/gfkdSy7/outlaws_dirt_track_racing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_e180e945dc94461d8ba658aad0572022.pdf?index=trueIn PDF document text
    • http://gutipebufige.epizy.com/68403144431.pdfIn PDF document text
    • http://movisupe.epizy.com/zimuxamemekojixopo.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_ce28020416c74a5083725653512469e2.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_0b9479781eb6405482cdfd61649f6cc4.pdf?index=trueIn 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_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 5296 bytes
SHA-256: ea429a00a60e36edfb9bd6c791ec5a2cdaa25a3850c25fa69890db2fa4d728a6
font_01_sfnt_off000110d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D5 12564 bytes
SHA-256: cfa10922ea17c28c6c0beefb5e0d91e050e170776de99d5b4799e62e107dee42

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