Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42b96a66a8c3bb4…

MALICIOUS

PDF

75.2 KB Created: 2021-05-28 03:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 313b173222f1a7bc20cf53fd97fb4a4d SHA-1: 73c24d7a17831bad5dac81d9c5d1e0f831d02ddd SHA-256: a42b96a66a8c3bb43e2bf236da0d726b045db3ea791f537b459d6767381d90d3
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, embedding numerous external URLs, including one that appears to be a redirector for a download lure. The document's content, though heavily obfuscated, suggests a deceptive lure related to drawing comics, likely to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=how+to+draw+noir+comics+the+art+and+technique+of+visual+storytelling+pdf+download PDF link annotation
    • https://xogedagiwen.weebly.com/uploads/1/3/4/3/134398587/pekaretaget.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_601bfaa1cc3a4.pdfIn PDF document text
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/ketubowilu.pdfIn PDF document text
    • https://relibekagojuxi.weebly.com/uploads/1/3/4/6/134605829/641212.pdfIn PDF document text
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/rudinip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5ff8282da3f6e.pdfIn PDF document text
    • https://jagewimaw.weebly.com/uploads/1/3/4/0/134012974/lafakavemagelev-kunibi-sidifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/138f41ae-b790-42ff-b911-30243bdb8c8e/rugadewevazupelavakofev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b0406c5-0afd-4208-980a-72b910925b09/48815876024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4616e2bb-76b3-425f-87c8-bfbdd72bf1fd/public_relations_director_job_description_non-profit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4adb20-cb45-4dce-ab65-7b00f3ebcfd2/44829825677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13be78f7-b714-410a-b501-0859c2c9d062/lasko_fan_blade_removal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484cea6f-1913-4adb-81ea-1a5d2bd58593/how_much_does_starbucks_drinks_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b25e967-89af-4a0b-ae90-4d3c6e93d362/frozen_wilds_world_datapoints.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e476c50-4634-4f0f-9359-19388fbb8984/how_to_pair_blue_parrot_headset_to_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aaa8c24-57e7-46be-be55-06d4fa9905a8/59715051599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a512a9-0668-4a42-86ce-af3f41206d71/2218529664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2be4c4a-bd54-4205-a5f5-bbec910ac17e/sennheiser_ew300_g3_firmware_update.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 5908 bytes
SHA-256: 7b329a0ed06bed74202ea44458142caf7cbde30987d4f244a029bfc171603cbc
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 11448 bytes
SHA-256: 262722e8d64b0f399502d6ec94a646b416aaaac47232b9597ebe226a3409c1bc