Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a37fa79b3a162c6…

MALICIOUS

PDF

87.0 KB Created: 2021-01-20 10:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 665396345e5058dd4ed8b04a846a7f38 SHA-1: 7efb728e34cdc2a72bf61cec324c752f75342310 SHA-256: 5a37fa79b3a162c6ddb6105cd2ceaf6bef842fde5408dbb04eb3660847525096
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. The embedded URLs suggest a tactic to redirect users to potentially malicious content or phishing sites.

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://leonvi.ru/123?utm_term=simple+pickup+project+go PDF link annotation
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/pozuga.pdfIn PDF document text
    • https://site-1179234.mozfiles.com/files/1179234/wemadopovezekob.pdfIn PDF document text
    • https://site-1177407.mozfiles.com/files/1177407/digimafefakizibosegowabo.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/voroduxovoke.pdfIn PDF document text
    • https://zukepuroxile.weebly.com/uploads/1/3/4/7/134746995/8db89ccdab.pdfIn PDF document text
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/b379bc48442.pdfIn PDF document text
    • https://site-1249328.mozfiles.com/files/1249328/flower_border_flyer_template.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/ZifMgfb/rabokurijazuvunivuxexav.pdfIn PDF document text
    • https://site-1177584.mozfiles.com/files/1177584/hd_wallpapers_4k_for_pc_cars.pdfIn PDF document text
    • https://site-1222430.mozfiles.com/files/1222430/rutat.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/wixifedijepi.pdfIn PDF document text
    • https://site-1173456.mozfiles.com/files/1173456/tom_and_jerry_race_full_movie_download.pdfIn PDF document text
    • https://site-1174988.mozfiles.com/files/1174988/survival_kit_earthquake_philippines.pdfIn PDF document text
    • https://site-1166597.mozfiles.com/files/1166597/screenshot_android_htc_10.pdfIn PDF document text
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/896343.pdfIn PDF document text
    • https://site-1180825.mozfiles.com/files/1180825/s_letter_image_wallpaper.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 5108 bytes
SHA-256: 134b11f260609739bb3cff4e06716036cf461d74b787081a4b266f48c1b28c33
font_01_sfnt_off0001289c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289C 11420 bytes
SHA-256: a17e986f21bc52816b8122f00555189648dfa7afdff15059021815521e763a2b

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