Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e816ad38abf464…

MALICIOUS

PDF

92.8 KB Created: 2021-03-17 11:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77ee374f16d7eb0700f5b546c9f88feb SHA-1: 40f6f303868a310cd4f8cfec42ffacb07bb5f9a7 SHA-256: f1e816ad38abf464720b8b309a279be6a6fb67719db7070d0e34664129356e32
176 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ML classifier and ClamAV detection. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech support scams. While no scripts were extracted, the PDF structure and embedded URLs suggest it's part of a larger phishing campaign, potentially leading to further exploitation.

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://lozipotod.ru/award?keyword=tata+sky+plans+and+packages+pdf
    • http://beststudent.space/510488715953rvy.pdf
    • http://mihetos.xyz/what_is_wrong_with_the_happy_color_appjnob0.pdf
    • http://jixuvofariva.iblogger.org/salary_expectations_answer_examples_uk.pdf
    • http://joblanc.xyz/what_is_bureaucracy_in_public_administrationkjd0l.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_a3f8b9a120fc4d3ab65b4b9ad349bca2.pdf?index=true
    • https://s3.amazonaws.com/bupesejirijejus/honeywell_k4392v2-h_battery.pdf
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_08b34a3017654ca28a506a44db802e6b.pdf?index=true
    • https://s3.amazonaws.com/kobivimelelo/business_meeting_agenda_template_free.pdf
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_0d7912b2202049ff8399d73950a19ec1.pdf?index=true
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_cebe13438f2c4ea7b75df89b33c25bf1.pdf?index=true
    • https://s3.amazonaws.com/wefadep/solving_equations_using_algebra_tiles_worksheets.pdf
    • https://s3.amazonaws.com/radubozufiwo/how_to_use_wps_button_on_android.pdf
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_003a3d9824f3436791f9c49d3a7113bf.pdf?index=true
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_32aad35279714721b949992f07006a6a.pdf?index=true
    • http://kuxixatizoxop.epizy.com/20306706587.pdf
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_52bfb58f03c843a78d937a5fd2d96ff5.pdf?index=true
    • https://s3.amazonaws.com/xukonakefules/volume_booster_windows_8_free.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_off00012d65.bin
0fc7f777e1c333337f87aac9752bd106367a0d802a32627bb8a53779955d212d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D65 5344 bytes
font_01_sfnt_off00013fbd.bin
e950e2e7b6e3905ca543937d9a1d03e41762606b807cf2e6efd9061fdeeb5b7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBD 11316 bytes

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