Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf3fa44e5d9c8e6…

MALICIOUS

PDF

76.7 KB Created: 2021-04-11 06:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 93096b45f774c82de191fee7cd5a6620 SHA-1: 206bd19fa1d60c17ad3273f64f238d9b7a0cc026 SHA-256: abf3fa44e5d9c8e616b4cee250af19cbc8e3c4ffbe1e05438c1f117809465e0b
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains multiple heuristics indicating malicious intent, including a critical finding for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains keywords related to payment and billing, aligning with the 'Payment redirection / bank-detail change lure' heuristic. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature, likely serving as a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/strik?utm_term=victoria+secret+phone+number+to+pay+bill In PDF document text
    • https://static.s123-cdn-static.com/uploads/4443821/normal_5ff7c442a2a54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_601c01ebbc531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496165/normal_606262b4b6482.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497688/normal_5fde21277765c.pdfIn PDF document text
    • https://cdn.sqhk.co/wemukubiv/jfyg8l9/layered_software_architecture_autosar_exp_layeredsoftwarearchitecture.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451545/normal_5feded6641198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387921/normal_6065b5239b72f.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/JgejcdD/4k_live_wallpaper_samsung_s10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446374/normal_603b9b8c554ad.pdfIn PDF document text
    • https://cdn.sqhk.co/kavatupopum/uhfihhe/dopevokagiteligilusa.pdfIn PDF document text
    • http://xulorobunikoxu.22web.org/tp-link_tl-wr841n_openwrt_reset.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugubukegi.epizy.com/35842985940.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_5144923f224b4eca9dda84de09457244.pdf?index=trueIn PDF document text
    • http://zowadakal.epizy.com/jarofi.pdfIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_4aaa471923904e4d973a6823788ac688.pdf?index=trueIn PDF document text
    • http://jawuguv.epizy.com/texto_argumentativo_y_sus_caracteristicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4452c12-5a2e-492e-a297-5826705b9ef1/dewalt_dwe7480_vs_dwe7491.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_9530f2ba0bd04e24aa559b24a0b2a54c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc644556-052c-4506-b21b-e6e15721cb76/mubikapop.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_43cd38091bdb4fd181a6a1fb13a4e0e2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 5380 bytes
SHA-256: c50f690df160186205c990cca0e46cefa40ebd2d0dc6a2805e029be21500a622
font_01_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 11148 bytes
SHA-256: 227b9ab3d49abb4c12ff6157480ff310b2b2c6dfe8eb1efc8f572cdefe4c9a7a

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