Malicious PDF — malware analysis report

Static analysis result for SHA-256 6949293fbd3fcd1c…

MALICIOUS

PDF

77.0 KB Created: 2021-05-30 04:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf53ccacfa09dce1bff15479948e2de2 SHA-1: 1e6b16e2e6d902b81b93d9d7bf676e95db17f6c5 SHA-256: 6949293fbd3fcd1c5bfc0a5cc6c1367ad33e3fa1f02d1c83c599becc76747f56
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm and an embedded URI pointing to 'dafemum.ru'. This suggests the document is designed to redirect users to a malicious site, likely for phishing or to serve a secondary payload. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the presence of external links and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://dafemum.ru/strik?utm_term=why+won%2527t+my+turtle+beach+recon+200+headset+work
    • https://static.s123-cdn-static.com/uploads/4374957/normal_5ff0720598c70.pdf
    • https://larebefol.weebly.com/uploads/1/3/4/6/134691273/b60f3facc.pdf
    • https://cdn-cms.f-static.net/uploads/4408718/normal_6022c56e60b43.pdf
    • https://static.s123-cdn-static.com/uploads/4411709/normal_5ffd6eaeaea1f.pdf
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/detemapivaj.pdf
    • https://nozuresosobud.weebly.com/uploads/1/3/4/7/134758814/demudomivebokenokuvu.pdf
    • https://cdn-cms.f-static.net/uploads/4494166/normal_5fdc371a77f7b.pdf
    • https://static.s123-cdn-static.com/uploads/4474977/normal_5ff8c38188e0c.pdf
    • https://cdn-cms.f-static.net/uploads/4368956/normal_605a3b3281fc8.pdf
    • https://cdn-cms.f-static.net/uploads/4464315/normal_601e74e2b1fe4.pdf
    • https://rixolojujosu.weebly.com/uploads/1/3/4/6/134622111/55e9a09.pdf
    • https://cdn-cms.f-static.net/uploads/4462697/normal_60173fb0dcd6c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/08eff337-9167-409a-a41f-09decc4caa58/how_to_adjust_orbit_metal_impact_sprinkler.pdf
    • https://uploads.strikinglycdn.com/files/11e7d246-053e-4190-acd8-87118d6f082b/wisidani.pdf
    • https://uploads.strikinglycdn.com/files/765287b5-e821-464f-abca-ec13adbe3e85/gegelekazaxegifuputediko.pdf
    • https://uploads.strikinglycdn.com/files/dc24482f-75e0-489e-aee8-768adb057096/download_wwe_2k15_for_android_ocean_of_apk.pdf
    • https://uploads.strikinglycdn.com/files/77033a91-bfcd-41ce-b7b6-56dcaef33f12/84972248600.pdf
    • https://uploads.strikinglycdn.com/files/12722933-9f1b-4d1b-b4f1-8308790df987/papad.pdf
    • https://uploads.strikinglycdn.com/files/4c514ccc-9f82-47e5-add7-cc38863c4033/90922707358.pdf
    • https://uploads.strikinglycdn.com/files/6bcc1cf6-b429-411b-833b-74474ec9388f/2526618803.pdf
    • https://uploads.strikinglycdn.com/files/3dbdd25b-91d5-40c2-b16e-bdcd53dd3e64/freestyle_shark_classic_clip_octopus_unisex_watch.pdf
    • https://uploads.strikinglycdn.com/files/5f92851b-e005-474f-9043-c6839904001f/what_another_word_for_slow.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_off0000ec7b.bin
e092df9cbe0354dafd77b3a2c8a147374a28382ef86ddddd91bd96bf98b2d2ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 5896 bytes
font_01_sfnt_off00010081.bin
044c98a3750ebe2440b0ac4845f8089a6126953866d8aa0109173c3e7174e8aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 11020 bytes