Malicious PDF — malware analysis report

Static analysis result for SHA-256 7407f35ebfe6ee43…

MALICIOUS

PDF

72.9 KB Created: 2020-12-21 13:29:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b6f89f3b3c870da24a898e06243edc7 SHA-1: 7e84d5421e64e27d0e4f0ac9a59006aeef9939cd SHA-256: 7407f35ebfe6ee436855a52c74ab9f25a767501dd1314f5ecb90b00a07d75493
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains a lure related to a 'high quality mp3 voice recorder app' and is flagged as a malicious redirector and an advance-fee scam. It also contains a large number of links to other PDFs, suggesting a link farm. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or scam attempt, likely leading to a malicious download or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://cctraff.ru/strik?utm_term=high+quality+mp3+voice+recorder+app
    • https://senabexe.weebly.com/uploads/1/3/4/2/134265557/sumumaluge-mufoj-lenidivim.pdf
    • https://famonusowofem.weebly.com/uploads/1/3/4/3/134349488/mowamizumofe.pdf
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/1507003.pdf
    • https://silifasakesi.weebly.com/uploads/1/3/4/5/134510621/gipik-gudaxegataro-fobowugiwu.pdf
    • https://dijizuwuke.weebly.com/uploads/1/3/3/9/133999270/3ce09fec85bb73b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xotomisen/discontinuity_in_rational_functions_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/043edd5e-9dd8-4cbb-bced-b6bba52d5bec/how_to_introduce_yourself_via_email_template.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf74cb474932ca2670e58/1606219597987/pico_tts_engine_apk.pdf
    • https://s3.amazonaws.com/suxugipipolazog/79744102304.pdf
    • https://uploads.strikinglycdn.com/files/ad9d5511-e1e4-4327-b395-59a4b058064c/abbott_and_fenner_scholarship.pdf
    • https://uploads.strikinglycdn.com/files/59762747-b777-4ed5-9c36-6362fef140b3/action_verb_and_linking_verb_exercises.pdf
    • https://uploads.strikinglycdn.com/files/fa1ba0fb-90de-4436-b34f-fb85837b83a8/exercise_physiology_and_disability.pdf
    • https://static1.squarespace.com/static/5fc18365f9866f3fd2d8aaf8/t/5fc513e1173fb5383b44c982/1606751204852/bivariate_normal_distribution_python.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_off0000e025.bin
14cb46edb8f781dbf37e2a4a295ed58ec84acc39065185068c5f6a49ccb2e760		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 5720 bytes
font_01_sfnt_off0000f37a.bin
0d457653270ecf48ab930bd872c4d3e438deda6e0c341394eb6d022a21525e50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 10432 bytes

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