Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d53ad61d238b091…

MALICIOUS

PDF

91.8 KB Created: 2021-03-20 23:08:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b2fb2037c08ff6ea44d3a46c3c150720 SHA-1: 25fd2e2b3c999cc6f771b876bc0940a71a6f514a SHA-256: 0d53ad61d238b09140ba28a9ae6f48d5f9842ec0bd8ded64737463dbcfdd3283
146 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a domain associated with phishing and link farming. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to educational materials to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ponafet.ru/award?keyword=basic+computer+networking+mcqs+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406202/normal_6032c806639ab.pdfIn PDF document text
    • http://stikc.xyz/warukesuvugaro1zsy2.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/Ax8UibF/88064166553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382208/normal_5ff62e4836858.pdfIn PDF document text
    • http://heleogose.online/summary_of_ethics_book_10lot88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_6038d5cb2bfd1.pdfIn PDF document text
    • https://cdn.sqhk.co/zavilisuga/QhfvLib/boomerang_maker_boomerang_video_maker_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496602/normal_6052338d15f26.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/do_all_wifi_thermostats_require_c_wire.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/XjhigfH/aimpoint_compm5s_mount.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_5fe983b411854.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/fEhiXn6/pofoxivomigolizoso.pdfIn PDF document text
    • http://samyog.ru/2363981124a4hma.pdfIn PDF document text
    • http://italia-doc.fun/7215985545794924.pdfIn PDF document text
    • http://7gusevshop.space/xakirifuwibi6vlfo.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/1c13c1cb-e6f4-4de5-915a-3ff8149a5d18/vetubuvejafedaruruxara.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/fanezasixij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3e29fa9-7467-4798-9105-6cd663e24093/does_burger_king_still_have_the_2_for_5_deal.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/philips_lighting_india_annual_report_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c507bd-8eb7-47d3-87c7-67e271055f53/polaroid_tablet_hard_reset_keys.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/xugojenajuwafitojagimos.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/51763759817.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/40299453790.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/tipazidivukofazogujiguma.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_off0001271a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271A 5776 bytes
SHA-256: c767f5c5aa311b1772dc3eb9e82dae27aba59892042a454f47c5deb819f5bf27
font_01_sfnt_off00013abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABF 11732 bytes
SHA-256: 31c129f4d6d14f8c9b7b23a126feddb66d4654a1ce80cb66fb17054fbec76176