Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65a9de5cb2d4e7d…

MALICIOUS

PDF

100.5 KB Created: 2021-03-09 04:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 14f27b8d4fcd97f9ac60f568fb2a1faf SHA-1: 5ef97e8c55f45d2389d5d11e9666b40f3d28d340 SHA-256: c65a9de5cb2d4e7d51f80880578ca71ff01948776937d346d22fca2926c81436
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though partially corrupted, suggests a lure related to 'Act-67c-practice english answer key'. The presence of numerous external URIs, many hosted on disposable domains or link farms, strongly suggests a phishing or credential harvesting operation. The primary attack pattern involves directing users to malicious websites disguised as legitimate resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=act-67c-practice+english+answer+key PDF link annotation
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/2031330.pdfIn PDF document text
    • https://jejenovo.weebly.com/uploads/1/3/1/4/131454593/6f2d4ddedeefe3b.pdfIn PDF document text
    • https://pigixona.weebly.com/uploads/1/3/5/9/135986477/5e7a2fbb5.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/webulupekefaz0on2.pdfIn PDF document text
    • https://cdn.sqhk.co/pabukerofo/Xge2hr0/snakes_on_a_plane_trailer_deutsch.pdfIn PDF document text
    • http://leqqurint.online/sparknotes_origin_of_species_chapter_6mc2v3.pdfIn PDF document text
    • https://zusavakaki.weebly.com/uploads/1/3/0/8/130815140/logurij-zofatokiwoz.pdfIn PDF document text
    • http://damvglaz2.xyz/navy_seals_workout_movey4vk3.pdfIn PDF document text
    • http://beautysss.site/851414009083dqgj.pdfIn PDF document text
    • http://joy-todays.online/how_to_write_a_warning_order_for_the_army2lyrm.pdfIn PDF document text
    • http://mosquito.codes/nisadomovafu9pdnm.pdfIn PDF document text
    • http://silvanozito.online/memiko5s612.pdfIn PDF document text
    • http://reduslim-ordina.site/tusasekujisejivumepewovkld84.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/E2gfAib/vajajoxevuzit.pdfIn PDF document text
    • http://mklhhhh.space/essentials_of_musculoskeletal_care_5th_edition_ebook7ucdj.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/ggkSZKV/folding_bushcraft_knife_uk.pdfIn PDF document text
    • https://zegepefuloruwan.weebly.com/uploads/1/3/4/0/134012378/ba9f96.pdfIn PDF document text
    • http://amandeepsadyora.com/tiwapulupegaxisudaredikipohygz.pdfIn PDF document text
    • https://cdn.sqhk.co/joxusozomilo/aJIujaR/pocahontas_read_along_storybook_and_cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7819a3b3-1be0-4db2-93b7-a0e05a420027/sinopajodurezapabivajivix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b5ea645-39b3-4c0c-83c3-37e215ddca08/brother_hl-l2380dw_wont_scan.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_off00014d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D81 5708 bytes
SHA-256: 568d46fde2998d55cf1ab1b0c06e56abf1091dcb03e5019d11ddd334ffa5e8c5
font_01_sfnt_off00016112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16112 10496 bytes
SHA-256: 70ac61a7e30cef44419b87fe69f0a8b42c5235065e556c23e31dda075ab2920d

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