Malicious PDF — malware analysis report

Static analysis result for SHA-256 35df4482f6973640…

MALICIOUS

PDF

82.9 KB Created: 2021-05-17 09:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ff6bc961de3690d85a537d8fb9f626c6 SHA-1: f30a0d32249bdf12f75e9c21bc43b60e839bd93a SHA-256: 35df4482f69736404b12833c0921313a5b2022b1313b77066f7aba97691528c9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the linked URLs. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=slingbox+500+hack PDF link annotation
    • https://cdn.sqhk.co/wanoposuj/djdgidN/14683838572.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/aiQjam7/cross_platform_games_xbox_one_ps4_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/ycWfgck/paper_rings_taylor_swift_lyrics_deutsch.pdfIn PDF document text
    • https://felelitujafi.weebly.com/uploads/1/3/5/3/135392562/vefum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5ffdd5ed79b4f.pdfIn PDF document text
    • https://wigobozigor.weebly.com/uploads/1/3/5/3/135345973/gibezelobogawof.pdfIn PDF document text
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/dokigenawabudixamawe.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/N1a8ajg/pazapubevu.pdfIn PDF document text
    • http://tavubejidira.iblogger.org/android_studio_jdk_configuration.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487905/normal_606ba6dcb1f27.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/DMPgegd/driving_zone_russia_mod_apk_android_1.pdfIn PDF document text
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/zajili-pewel.pdfIn PDF document text
    • https://cdn.sqhk.co/jofomopunaw/hhnNhef/minority_scholarship_2018_form_online.pdfIn PDF document text
    • http://bemijaragilez.22web.org/19th_bluebook_citation_format.pdfIn PDF document text
    • https://cdn.sqhk.co/fovekuleru/5jhiasC/22706121694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_6026335c20e80.pdfIn PDF document text
    • https://jojobejuw.weebly.com/uploads/1/3/2/8/132815094/badikidum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bipitor.epizy.com/acropora_formosa_verde.pdfIn PDF document text
    • http://kigapamoxatiw.epizy.com/58250352778.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18cf611a-36d8-4db9-b6be-d27fb51ec9be/why_did_monster_garage_get_cancelled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6133e502-35ce-4a5d-85a0-2850c9ea69c7/resumen_de_100_aos_de_soledad_de_gabriel_garcia_marquez_corto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1097fe26-06c8-4799-995f-02c21077f173/48012266923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79b1a38f-bb83-4b12-82c8-acd154b1f8cb/journey_to_the_west_movie_in_hindi_720p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ee26f8-2337-4107-89d6-56b3e6377494/kevibiwolapadiwabisejif.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_off00010264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 5428 bytes
SHA-256: 1d90bfd6b348236b99f2eea0c4e319397f82c49e1c223d4a18c9245937073989
font_01_sfnt_off000114e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 12804 bytes
SHA-256: f2314e395afd4ae37836f9ddbc401b91702f4b735bfd199d647e3f88229f9b21