Malicious PDF — malware analysis report

Static analysis result for SHA-256 9469d4fbc6bf75f0…

MALICIOUS

PDF

73.3 KB Created: 2020-11-28 02:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50f604e13ac8a36a400698434c3f3c6a SHA-1: bf84e322a01849f39a9283e42dd560964e119f68 SHA-256: 9469d4fbc6bf75f06c459b4017fc72e308edc627887c9a61a68bb0ae6de86b2f
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'trafffe.ru', which is likely used to host a phishing page or download further malware. The document body, though heavily obfuscated, contains strings related to 'us government chapter 3 test answers', suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/123?utm_term=us+government+chapter+3+test+answers
    • https://cdn-cms.f-static.net/uploads/4418379/normal_5f99e9632ee1a.pdf
    • https://cdn-cms.f-static.net/uploads/4413236/normal_5fa2bded2aac9.pdf
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5f8e2a9353226.pdf
    • https://cdn-cms.f-static.net/uploads/4418786/normal_5f976078adfee.pdf
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5fa0c8ee35a89.pdf
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5fa7fe209f717.pdf
    • https://cdn-cms.f-static.net/uploads/4410952/normal_5f9be03ebb98e.pdf
    • https://cdn-cms.f-static.net/uploads/4403674/normal_5f9585437a626.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pibajuwi/segutiwefosutupu.pdf
    • https://uploads.strikinglycdn.com/files/afae328b-d9e0-4735-84d0-efdcf45002d6/barbie_life_in_the_dreamhouse_characters.pdf
    • https://uploads.strikinglycdn.com/files/b0df58db-0a45-4b5b-915b-c091811cf496/come_screenshot_in_acer_laptop.pdf
    • https://uploads.strikinglycdn.com/files/930612cb-97e0-425e-b0e9-b98157274f0c/37858771174.pdf
    • https://uploads.strikinglycdn.com/files/80bc7ddf-e9bd-4160-9378-b63daf810edd/43048344353.pdf
    • https://uploads.strikinglycdn.com/files/d72d8938-e896-417d-991e-83039bf04e13/travel_english_phrases.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f0.bin
ca5e50491aa2df71d4a35a056aebb996b103ae24da007702499d8229fca002fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 5364 bytes
font_01_sfnt_off0000e80b.bin
8effd13317301adf3ca16566074f59a8cc6016580c39fee246127f6d46f8ea6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 9860 bytes
font_02_sfnt_off000109da.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 4324 bytes