Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3830810bc6c8a9…

MALICIOUS

PDF

78.4 KB Created: 2021-03-10 10:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4abd7bacac3472312573211b4261c95e SHA-1: d6d3563c6ccd0a7e48950b92c2e05622dbf49e7c SHA-256: 8a3830810bc6c8a94c55d690bbd461b72f7ba2eb53d689810e72e8a03e76dd0e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=words+that+start+with+the+letter+n PDF link annotation
    • http://zereteleriw.getenjoyment.net/34067113308.pdfIn PDF document text
    • https://cdn.sqhk.co/sulugedako/Q8jfic4/pokeball_plush_target.pdfIn PDF document text
    • http://jawunefuda.mygamesonline.org/xefuxisetotetuvivolol.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/YjcgcM6/mvp_award_certificate_templates_free.pdfIn PDF document text
    • http://zabolojisag.getenjoyment.net/17543226810.pdfIn PDF document text
    • https://zuxusesomopekem.weebly.com/uploads/1/3/5/3/135305840/kumijen_tusuwatas.pdfIn PDF document text
    • https://kavosimodo.weebly.com/uploads/1/3/4/9/134901779/dudexugowurenubedu.pdfIn PDF document text
    • https://cdn.sqhk.co/kumipexa/hcMUEFl/berapasi.pdfIn PDF document text
    • http://toworugesolur.getenjoyment.net/lofuwamajotarog.pdfIn PDF document text
    • http://bukobaxaz.getenjoyment.net/rukaranitusujudabisor.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/gcgcv1K/sticky_block_css.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
    • https://uploads.strikinglycdn.com/files/79517843-3959-4dda-bb53-e1f488f70330/sakupe.pdfIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_aece1a275d5f45b9ac0e404e8ab9e1ff.pdf?index=trueIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_d944f09936a74601a85272b07d4392b4.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_0c0e90a7704f4e58994b323d49c12ee2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22c92db4-dbd9-400b-a316-5fd4a2d25095/tissot_t-touch_expert_solar_price_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab1ad99-71b4-42f4-b075-531fcd576b40/cuisinart_dlc-8sy_pro_custom_11-cup_food_processor_parts.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/the_road_less_traveled_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e6189d4-e3c2-4c40-957f-1e6902ba18ee/kobalt_8_gallon_air_compressor_lowes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 4804 bytes
SHA-256: 001b49a678bfcf7acc66e0f6d33d8dd707a2b9dbd1f6b2424e766ebcb5024bce
font_01_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 10428 bytes
SHA-256: 581e642a6df8ec6f134923bff05f059d4d840d2b33d043de86e5ab78c5be95dc
font_02_sfnt_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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