Malicious PDF — malware analysis report

Static analysis result for SHA-256 a310992c1ed8cc89…

MALICIOUS

PDF

76.4 KB Created: 2021-04-08 04:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bff6645da33ce3fe7c975d6e7ce36926 SHA-1: c0f7b2c1d9aaa8733a0ff3ee144b10227a9322f2 SHA-256: a310992c1ed8cc897ec7c7bc645c38ff784b73277e21f6f9a3f053700da47f8f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on 'fokemale.ru', which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=cfa+curriculum+2020+level+3 PDF link annotation
    • http://introdom.ru/225779606330eu3z.pdfIn PDF document text
    • http://galoomer.online/startup_owners_manual_checklistsemjjv.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/viwixojuvoz.pdfIn PDF document text
    • http://abzac.me/gogeno7rfk2.pdfIn PDF document text
    • http://ita-bio.fun/16841104037qcj12.pdfIn PDF document text
    • http://kismykeitio.best/2971130335rte6g.pdfIn PDF document text
    • http://1ux.site/new_bhojpuri_video_film_ingsfz14.pdfIn PDF document text
    • http://onlinetiser.website/newuwojaja3sby4.pdfIn PDF document text
    • http://b4shop.icu/the_man_in_the_high_castle_season_3_finale_reviewheak8.pdfIn PDF document text
    • http://sneakerspapa.store/important_maxims_of_lawnomsl.pdfIn PDF document text
    • http://samyog.ru/hachi_japanese_restaurant_menun9lg9.pdfIn PDF document text
    • http://zotikarida.medianewsonline.com/fezojulivojegasiwisej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/31661127382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30362aac-5da3-4c3e-af1d-0ba411b5a43a/download_divergent_sub_indo_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/88306566851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26605de5-6657-487e-b61e-78229de89b79/pampered_chef_food_chopper_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8e2642a-8ca5-4836-b49a-70706c598424/fovasusajebaforof.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/fanamiroxigepixod.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/list_of_old_sanyo_tv_models.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72898380-573d-47b7-9d48-2fcb8106042b/bajeze.pdfIn PDF document text
    • http://fadudenomo.onlinewebshop.net/misinoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f4fadd-aaf3-42db-be6c-261f761db333/dolokaniroboxurinexopu.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_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 5252 bytes
SHA-256: 4130361e36e51c29a7b2ae89058de0cce4589fad3e373cdba1fea9456d6b12af
font_01_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 10908 bytes
SHA-256: 407607a089c8ff086484377359b52d77f75146ef8d5e6b11cd589c16348d94b6

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