Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7327452e9f8d73…

MALICIOUS

PDF

79.9 KB Created: 2021-03-20 07:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c18785ea866c96652325571207089c0 SHA-1: 2e2d1fa8ba716dd36963f7e606243d5d07d8b0af SHA-256: bb7327452e9f8d73dbd281902b9966cbe56e5e894f9457616fc4164257e02175
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm. The primary external URI, https://ponafet.ru/award?keyword=application+of+cdna+library+pdf, suggests a lure to a potentially malicious site. ClamAV detection and ML classification further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-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://ponafet.ru/award?keyword=application+of+cdna+library+pdf
    • https://taleputara.weebly.com/uploads/1/3/4/3/134305900/nafepo.pdf
    • https://titugujogimob.weebly.com/uploads/1/3/4/0/134017720/narafafivijaleraxeg.pdf
    • https://rumitubo.weebly.com/uploads/1/3/4/5/134525427/jizalomuk.pdf
    • https://futibiwis.weebly.com/uploads/1/3/1/4/131408183/fukelev.pdf
    • https://cdn-cms.f-static.net/uploads/4370275/normal_5fd6cd83744e9.pdf
    • https://static.s123-cdn-static.com/uploads/4370073/normal_6005450b3a384.pdf
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/ladepojupose_pufakuwawerazo_rezegasisosavu_zilifom.pdf
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5fd885efa0ca8.pdf
    • https://mepurukog.weebly.com/uploads/1/3/5/3/135306658/vuzokokoti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/timeziso/conair_1875_watt_cord_keeper_hair_dryer_aqua.pdf
    • https://s3.amazonaws.com/wifiduxezo/31687719223.pdf
    • http://molezadidusoser.rf.gd/sanguine_melancholic_choleric_phlegmatic_test.pdf
    • https://s3.amazonaws.com/regovadeje/rekidevapanukonel.pdf
    • https://s3.amazonaws.com/daselex/mofexevegosurekoxarimopap.pdf
    • https://s3.amazonaws.com/lowebemuwojiso/vuzurufowapod.pdf
    • https://s3.amazonaws.com/nafoxuda/50072053953.pdf
    • https://s3.amazonaws.com/xakajoziwibi/47913896372.pdf
    • http://jarafaso.epizy.com/bitmap_image_converter_to.pdf
    • https://s3.amazonaws.com/lanaladu/46808128706.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_off0000faf3.bin
843b7634c799087aaa0e979395aef8109b05e2a332b637b82c53c488414d260e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 5200 bytes
font_01_sfnt_off00010cbd.bin
50354f069226eba03c3722ea968e445fbe55eb29f50cb9d96377e4fcb9cbc5a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 11032 bytes