Malicious PDF — malware analysis report

Static analysis result for SHA-256 318a4f044305ff2e…

MALICIOUS

PDF

70.7 KB Created: 2020-11-23 04:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 613f093631a209388f430d6b6c0a3ac2 SHA-1: 101e82835b97e6333adb01d645155c94d4c27322 SHA-256: 318a4f044305ff2ee68719fce79342a011b30fd97df515dcc90d80a5b8b0e8b7
96 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://traffnew.ru/wb?keyword=blank%20nyc%20jeans%20size%20guide', which is likely a phishing or malware distribution URL. The document body is heavily obfuscated, but the presence of the malicious URI and the overall detection indicate a malicious intent, likely related to spearphishing.

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://traffnew.ru/wb?keyword=blank%20nyc%20jeans%20size%20guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420747/normal_5fa7181fd695c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_5f9f5b7f6b05c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_5fb6e29ae78f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f8a71cda8440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_5fbad58d445e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/48721108277.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/background_check_form.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/stick_war_legacy_upgrade_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e303cbdc-4b75-40aa-81a9-ab5b3d9b299c/melalonizavukimagiwalaren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff88fd47-c9c2-48f9-91e6-a92a1d379bc2/map_of_marsh_cave_ff1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd07fc18-7cc3-4ac1-affa-f0c086e4f9f7/dozawibotujavigo.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/64358720186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c37bbb-9418-43d7-ac4e-5d245f48c309/fallout_4_survival_mode_leveling_gui.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fefb04e5-bf5f-4f8f-a6b4-4508c57bd3de/book_the_nest_cynthia_sweeney.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73F 5044 bytes
SHA-256: 42943bd81659316978607ad4267d3187538e179873dd01c1da24f2bd3fd0b3a6
font_01_sfnt_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 12012 bytes
SHA-256: a18f3f1d9c5d8239a03d07ed5e25b9b7385aeeee359ad278f1f35ff6a120c67f
font_02_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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