Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2490521e536408…

MALICIOUS

PDF

84.7 KB Created: 2021-05-17 19:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f39e1013bf3ca19769ead1c8d96775b0 SHA-1: 4ecb1ba31b1c38fc8959805abd483e11c4aa836f SHA-256: 4f2490521e53640851d80eb644aff082d431b7b88f7d3a6c86bb6ad765a59650
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or link farm attack, indicated by the presence of numerous external links, many hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=vitapur+water+cooler+leaking+from+bottom PDF link annotation
    • https://pumebogevi.weebly.com/uploads/1/3/4/5/134583518/8f89ead3b921f.pdfIn PDF document text
    • https://cdn.sqhk.co/muwitajo/TgjfB9B/toronuwopebud.pdfIn PDF document text
    • https://zesukixugedun.weebly.com/uploads/1/3/4/5/134593530/dec169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463005/normal_600730cbd1504.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/gggj00B/top_10_missile_defense_system_us.pdfIn PDF document text
    • https://putoluvutawubu.weebly.com/uploads/1/3/1/4/131437806/digokoxog_gufugosolarenis_fubabakuxeluvo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444864/normal_5fd05f0db54aa.pdfIn PDF document text
    • https://vasuwogi.weebly.com/uploads/1/3/4/0/134017955/240370.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/fjbjihh/siren_head_guide_horror_game_scp_6789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410186/normal_5fdbd0e5047e9.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/bejujoziwuwakifom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421061/normal_603bd23a767ca.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/jjijhdr/dj_chetas_love_mashup_song.pdfIn PDF document text
    • https://cdn.sqhk.co/bipokagiti/ggf4BPV/caption_for_facebook_profile_picture_in_marathi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420743/normal_600b32ac8cd44.pdfIn PDF document text
    • https://xosipepimebat.weebly.com/uploads/1/3/2/6/132682768/5865662.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://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_0954fd28f33f4de983f09e9d59fe4369.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e74e0c5-b041-4261-87b9-c9f096b4f439/how_to_have_boundaries_in_marriage.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_47b602ab665d44a59538a97fe5418e63.pdf?index=trueIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_92e06f6a8cfc411eae3cc1ee363876ca.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_db56b7ac9d014651993bbcf38b2610e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b6a3da-0a5c-4b0f-af9a-9c6f3b4454c2/xowatev.pdfIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_261e7374bd574b9e86bd307c2cd566e5.pdf?index=trueIn 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_off000102a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A6 5300 bytes
SHA-256: 7fc7d9abbd8d77ea201e6aa726fd6681976a49e77d46bc90a24a2d418fa74738
font_01_sfnt_off000114aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AA 10104 bytes
SHA-256: 0f844ff57b7258e65977d9cfeb3660e93cc28a0c1434b4b9c7dc2cd8784f8339
font_02_sfnt_off00013706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13706 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2