Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4ecbe1fd879bd1…

MALICIOUS

PDF

84.7 KB Created: 2021-04-30 16:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 551217b114dbc959a64921b7387a5ee1 SHA-1: 5139bc950446974dd75b0f83dc651f901363d917 SHA-256: 5d4ecbe1fd879bd1068e95e6289bbca02d70a2676e96b20bdcbf5b83ae4fd9dd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous external links, a common tactic for phishing or scamming users. The heuristic 'SE_CALLBACK_LURE' specifically indicates a callback phishing or tech-support scam pattern. The presence of embedded URLs and the ML classifier's high confidence score further support this assessment. Although no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious or scam websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=how+to+connect+my+vivint+panel+to+wifi
    • http://juwoniki.getenjoyment.net/architectural_digest_magazine.pdf
    • https://cdn-cms.f-static.net/uploads/4387241/normal_605010dd6b5ef.pdf
    • https://cdn-cms.f-static.net/uploads/4383132/normal_60676f0d925de.pdf
    • https://static.s123-cdn-static.com/uploads/4421641/normal_5ff5f75133c46.pdf
    • https://cdn-cms.f-static.net/uploads/4483362/normal_5fe7e9eda21b1.pdf
    • http://myluckywin.site/can_ps2_singstar_mics_work_on_a_ps3pyiob.pdf
    • http://jotafitosixa.getenjoyment.net/basic_workout.pdf
    • https://cdn-cms.f-static.net/uploads/4448750/normal_600bca19a1b33.pdf
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5ff3c7fe5b181.pdf
    • http://graatorama.fun/fefisalesunuljjeqd.pdf
    • https://cdn-cms.f-static.net/uploads/4453344/normal_60203df49df92.pdf
    • https://cdn-cms.f-static.net/uploads/4494889/normal_600eacc76682b.pdf
    • https://cdn-cms.f-static.net/uploads/4408588/normal_5fd9175c84986.pdf
    • https://cdn-cms.f-static.net/uploads/4454684/normal_6067398dcbd62.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_8db392a6afe1429ba29698237608cea7.pdf?index=true
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_cc7e5315d61e4eab89a21b850d2ccae3.pdf?index=true
    • https://d572dbd6-ec42-402e-884a-3db6daac2318.filesusr.com/ugd/6a558d_e09e6008484b4768b00ac6a016bdcab1.pdf?index=true
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_0625a24467da4c68a8e815d0d348a7d7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1a7dbc56-4e2d-41db-bdc2-f4b5b41a0343/81960865384.pdf
    • https://uploads.strikinglycdn.com/files/eef86d4c-f985-4b3b-b398-f202afc7c00e/nejikidilinij.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d26.bin
e6c29acc2d8b70686247be2be7e19e4252460c744f5e02d9c91a01b951643cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 5100 bytes
font_01_sfnt_off00011e91.bin
8a876f80cf3b373dbf2d238144227b9fb63f0ca047eaf6a0bcccbf5e55befbcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E91 11444 bytes

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