Malicious PDF — malware analysis report

Static analysis result for SHA-256 06724f2d02b73a02…

MALICIOUS

PDF

73.6 KB Created: 2021-03-15 16:29:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0238d629dca1e0e70832269f43b86360 SHA-1: a0d885aa3ff9f25bb120289bdaf826a7ca3aa432 SHA-256: 06724f2d02b73a02b8754cdf378634a1cbb50fcb773b8562eb9addd29eb9bba5
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The embedded URLs and the heuristic firings related to link farms and SEO point towards a malicious workflow, potentially distributing further malware or engaging in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/award?keyword=interior+architecture+books+pdf+free+download PDF link annotation
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/givufudiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408462/normal_5fcfac5b5311e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443809/normal_603f7a7906fd3.pdfIn PDF document text
    • http://azalea.store/1_bachillerato_english_exercisesnn3pl.pdfIn PDF document text
    • http://radanews.site/dark_raider_mod_apk_1._00fq0a.pdfIn PDF document text
    • http://neyroskakalka.site/63804193430ea1dn.pdfIn PDF document text
    • http://construt.site/wolavitiwipbil1e.pdfIn PDF document text
    • https://xegilebul.weebly.com/uploads/1/3/4/3/134347284/7029154.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404738/normal_5fec92e360b0e.pdfIn PDF document text
    • http://xozonline.ru/nike_air_force_ones_womens_high_topselwoo.pdfIn PDF document text
    • http://avbox.org/acadsoc_training_kit_salary_answerslf9fj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_601128a24b34e.pdfIn PDF document text
    • http://it50life.pro/lightning_crack_sound_effectbkscn.pdfIn PDF document text
    • http://help-violation.com/kindle_paperwhite_3_format_plikulwhza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_614be22c7bb248b1925c7dd203e0bfd6.pdf?index=trueIn PDF document text
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_f7c41611277f40c49c0a61df64902943.pdf?index=trueIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_5bae63f2663244eb955ff40feb3f8f89.pdf?index=trueIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_c40a4c09e4a44290aaa2d1e7b656dead.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7817eedd-1192-4cad-9452-8a47cb93119c/how_to_put_line_on_abu_garcia_baitcaster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d54ecc69-0b65-483c-bfd8-70ceef7b55e0/nesukakedamoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ddc9cf-3339-4020-a757-3a707bdcca6b/jakozuwevajibudita.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_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 5476 bytes
SHA-256: 54d8f992ae6e1471071020ac66660d48ffed58b60bc2f79b7a7c40ea5a7e1c44
font_01_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 10776 bytes
SHA-256: 2203c7447454475e41fad84a5284509d8cccfe19c3422ab35d4c518060a46571