Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d06fce9a9a86980…

MALICIOUS

PDF

81.4 KB Created: 2021-03-21 21:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6e7f032b1185df6d6468470d5ed97518 SHA-1: 6413ca5413306fe9be9101aaf4041b81ec1fea55 SHA-256: 7d06fce9a9a86980e58d26cd00536051ee36eb65e6ce97c6636b4e1221fd062d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggest this is a malicious SEO poisoning or phishing attempt. The embedded URL `https://vilenefex.ru/wix?keyword=hcc+final+transcript+request` is likely the primary lure, while the numerous other links serve as obfuscation or alternative destinations. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=hcc+final+transcript+request PDF link annotation
    • https://cdn.sqhk.co/mumesimasozo/ATfAjdU/art_of_conquest_dark_horizon.pdfIn PDF document text
    • https://jisogixisizula.weebly.com/uploads/1/3/4/3/134328009/cc982b9ab18.pdfIn PDF document text
    • https://rewagafiwexufot.weebly.com/uploads/1/3/1/8/131856649/lomovikiribab.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/9598824.pdfIn PDF document text
    • https://nidatufibamukun.weebly.com/uploads/1/3/4/1/134131265/deffed54e2ca.pdfIn PDF document text
    • https://dawasaga.weebly.com/uploads/1/3/0/9/130969366/gadenuwunuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/eEWjbii/89120202155.pdfIn PDF document text
    • https://cdn.sqhk.co/wesurewilo/iaihehc/partnership_appropriation_account_format.pdfIn PDF document text
    • https://cdn.sqhk.co/majukedow/jfoJjaW/bitlocker_for_windows_7_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/ie0id40/pixlr_express_photo_editor_online_free.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/91bab8b9-6a6d-4fc0-862d-1f4d2ee87add/mortal_instruments_movie_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/gameboy_color_emulator_android_apk.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_5f83113c0325404ba75bf7610a0c2a22.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de2c898-6b05-4cde-a14d-4bd6b45cd759/how_to_use_braun_ear_thermometer_on_baby.pdfIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_ce498e84e06f4621a205cf11185888cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/bugabitixokodidoramojiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8366e2a-18c1-49d9-ad9c-c5083185dc65/eddie_bauer_infant_car_seat_and_stroller.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/new_war_movies_2019_bollywood_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cede9fc6-0c9f-4e50-b0a2-5351ff3db735/mujejeresajufadutape.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/50931148066.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/where_is_closest_post_box.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_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 4868 bytes
SHA-256: 90fe869bb3e1e85a630f541e85b0f9eff5ae7e883671ea7b7832aff1271f46d5
font_01_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 11144 bytes
SHA-256: 78cb2e3948674e2fac181e643b3cd186129b2eb44565f37e31387bbf8b5a17c8
font_02_sfnt_off00012a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A65 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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