Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b7676d080c21a0…

MALICIOUS

PDF

81.2 KB Created: 2021-04-11 15:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d9ad863054f12618c6c6b1db8783a88f SHA-1: b9573a8f132779be8b87e5c21d428a03b54b5c4e SHA-256: a7b7676d080c21a041d5eae378d77c3a530f6fccb2134a616a39072d2f870396
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a link farm, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a product manual, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/strik?utm_term=panasonic+phone+headset+model+kx-tg7871+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366995/normal_606611dc5f966.pdfIn PDF document text
    • http://garobunatuxovi.scienceontheweb.net/femikud.pdfIn PDF document text
    • https://saxunada.weebly.com/uploads/1/3/4/8/134865385/c66dd07cbde.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/giiagjx/82669462210.pdfIn PDF document text
    • https://kulilopoxi.weebly.com/uploads/1/3/4/3/134375859/folanojutulak.pdfIn PDF document text
    • http://help-feedback-amzn3.xyz/eragon_inheritance_book_47wczd.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/zedexibarenaviz_rekatajeg_zukozis_lilafarib.pdfIn PDF document text
    • http://titanof-filtr.ru/the_go_giver_influencer_quotestgrba.pdfIn PDF document text
    • http://8gusevshop.website/baby_shark_halloween_decorationsmihk9.pdfIn PDF document text
    • http://bisapusid.mypressonline.com/lefatizipafematawipebu.pdfIn PDF document text
    • http://jewlgems.com/safety_1st_guide_65_sport_convertible_car_seat_reviews80gp4.pdfIn PDF document text
    • https://jedagafigi.weebly.com/uploads/1/3/1/4/131438055/sotuxurawemowafefile.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/geURDja/burger_king_specials_today.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/mazas.pdfIn PDF document text
    • http://instasurprise.online/wahl_clipper_guard_16syg6x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444852/normal_606d2f8d31b4b.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/92250152637.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/jdjcBhg/prehistoria_significado_espanol.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/a2d94e09-82ac-4dc0-98fc-7733364f9118/korepevudamaz.pdfIn PDF document text
    • http://vawinujofupin.myartsonline.com/new_headway_english_course._beginner._teacher_s_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35a163d-97df-4e29-a5bf-ecced295beca/mens_health_training_guide_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f2a8fc-6e12-4176-9b4c-b66d780935cb/75549034589.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 5880 bytes
SHA-256: e8a7eaf2320c87f420c4245c94ce5a8f55eb616576989fd7c9df88907e52557c
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 11196 bytes
SHA-256: 06636a6129e605a5008770b4b831201885a78cbba8f07e55bdeda3347c87dad7
font_02_sfnt_off00011f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e