Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d24ab090d02d76…

MALICIOUS

PDF

81.9 KB Created: 2021-06-01 19:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 707ef7245249be797f2a345a6e8a3512 SHA-1: 9fc9aa471ab7ebdd76cc084eab09c45d2778a3ed SHA-256: a7d24ab090d02d76e22cbb4104f39244f7c820e95ea182bac4900fde6a6b31ee
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to generate traffic or distribute further malicious content. The document body is heavily obfuscated, but the presence of numerous external links is a strong indicator of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://archism.ru/pbw?utm_term=summary+of+the+golden+kite+the+silver+wind PDF link annotation
    • https://dumerozum.weebly.com/uploads/1/3/4/6/134611270/surokegela.pdfIn PDF document text
    • https://rixodinek.weebly.com/uploads/1/3/5/3/135392020/28ecc0097f.pdfIn PDF document text
    • https://galatowev.weebly.com/uploads/1/3/4/3/134325578/dafarunazut-jazikikanigaxi.pdfIn PDF document text
    • https://foxewazijibaj.weebly.com/uploads/1/3/1/3/131379544/ecf96fa6210.pdfIn PDF document text
    • https://jazazigiw.weebly.com/uploads/1/3/1/3/131398077/31578fdd73bd6.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/rubowezet.pdfIn PDF document text
    • https://bopifodefow.weebly.com/uploads/1/3/4/3/134383970/1469128.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liguduper.pbworks.com/f/xugirofigebudadexi.pdfIn PDF document text
    • http://fevosezew.pbworks.com/f/favifulewurezun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c589fb3-dec3-47e4-a95c-103ff50d4283/xavijeresukawudana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037be11b-7fb7-48c9-8793-d35593d19036/is_el_pollo_loco_keto_taco_really_keto.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/daxejibudadiwasuwuvas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed1a440-e1ca-4054-aa97-b14ced8e65cd/13006006307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40701229-3985-4126-b903-0939eef698bb/baxolefagixabojofifuzepe.pdfIn PDF document text
    • http://ridelox.pbworks.com/f/best_parking_simulator_ios.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/f/how_do_i_transfer_notes_from_iphone_to_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca479877-4cf5-4e56-a843-352c17e554f5/vaberanububen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05add188-624a-425c-a6b7-cf8732a3fe9a/ontological_argument_reasonable_faith.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144411933/do_you_have_to_print_your_southwest_boarding_pass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46d13136-6769-4a1b-a05b-55b9fe9a7ef6/89333421914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b4e147-8374-4138-bed9-a6a38d404dc9/bell_radian_650_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f941fb5b-ec3b-47eb-b490-9447a85922a9/dobisezir.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_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 5740 bytes
SHA-256: 55f207e498b8483cb4f96f8ed6637b2f765ad4749d967f23a28f7262ecaabadf
font_01_sfnt_off000112d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D0 10908 bytes
SHA-256: f7f1b250c4a62c88e9d2637ca9450b4cdd0928755d465677e6cd337b0cc2f987