Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd86d29f07f43d2…

MALICIOUS

PDF

75.0 KB Created: 2021-05-28 01:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1adea70817592ffa07b6511ce054b20b SHA-1: 54c4e51b9ddd58970a5c4b3d9478f63c73b12e80 SHA-256: cdd86d29f07f43d22cb5c24ff5253d5c5ac40258041a6ec702b96572cd4151b9
304 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm designed to distribute malicious content. The heuristic 'SE_SECRET_RECOVERY_LURE' suggests the document may also attempt to phish for sensitive information like recovery secrets or private keys. The presence of embedded URLs and the ML classifier's high confidence score support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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=very+fit+pro+ratings In PDF document text
    • https://wigalibole.weebly.com/uploads/1/3/0/9/130968912/tedijifupamigimonebu.pdfIn PDF document text
    • https://lodiwuziwinum.weebly.com/uploads/1/3/4/5/134502140/8699583.pdfIn PDF document text
    • https://bazamafew.weebly.com/uploads/1/3/4/0/134016738/868a302157e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_60315b9aa1549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_605f6a00e29d9.pdfIn PDF document text
    • https://duwiwobejul.weebly.com/uploads/1/3/2/7/132740292/7781284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_606797abd64e0.pdfIn PDF document text
    • https://sokarapojuler.weebly.com/uploads/1/3/1/1/131163736/35463a1e.pdfIn PDF document text
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/xidimudof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408583/normal_6041808992b3e.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/2ee13afa-e8ad-4340-949a-b445d7795f0d/how_to_remove_wickes_soft_close_toilet_seat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3da4f401-01d0-4c99-b986-0f88ee05e449/how_to_fix_my_kenmore_700_series_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f40d7a89-3c6c-4e2d-808b-00a3f6c27a3d/tajuwisigex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f10cf3e2-31d7-45ef-be61-df7b5c3c8cb4/best_diablo_2_mods_2020_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded4e090-4a36-470d-bef2-d44ecd1e96cd/how_to_lose_body_fat_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f075e025-d4c5-4ca3-88e3-767e6bac5b16/craftsman_17_inch_rear_tine_tiller_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fa790e-967d-4321-8b83-089531336245/pagezupojomuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49110fc1-b294-4c73-8f8a-4d44d4631cdd/canada_visa_lottery_online_application.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_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 5104 bytes
SHA-256: d3de372963e1453e7c9e5e793ca757a31b2decc3d10fa59012d27123acd5f0b8
font_01_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 11036 bytes
SHA-256: b9e5d33c46307062bc6d53ed730c0a621b4a26e4b215ca8edcb03571abddc750