Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55e2d1b0f4646ca…

MALICIOUS

PDF

77.6 KB Created: 2021-03-28 18:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 36745acefae354d7c1f0168cf7668cf0 SHA-1: 676cab8e625ef5e5cffb567611a56a1e83fe111a SHA-256: f55e2d1b0f4646ca483f04eab8516178824094e0fdfd08968ae8a5a05372773b
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=does+light+relief+work PDF link annotation
    • https://rijopadanag.weebly.com/uploads/1/3/1/0/131070137/1101842.pdfIn PDF document text
    • https://riligasiguvenu.weebly.com/uploads/1/3/5/3/135392009/11c5be.pdfIn PDF document text
    • https://wikexedijul.weebly.com/uploads/1/3/4/6/134659224/8395113.pdfIn PDF document text
    • https://cdn.sqhk.co/lulaxujik/fA7pVhh/wyvern_milk_ark_crystal_isles.pdfIn PDF document text
    • https://cdn.sqhk.co/gatuwaven/iiiBjam/idle_city_builder_games.pdfIn PDF document text
    • http://zumodaronomana.iblogger.org/piriform_ccleaner_registration_license_key_free.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/diwatufu_muwaxufo_goxazifomuje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_91a82552115649fb95b03289b7642818.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1844cd32-8a27-4870-96eb-fbd245a484e0/anti_hbs_test_price_philippines.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_a893ba7f98484a728ec1c10f2c517b5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcd02fda-42a8-4212-9059-6aeef65b91d1/tepanogetikulaxasoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c551eac2-699f-4696-b554-f6b6fdfa2df5/best_algo_trading_platform_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f589db74-210b-4c7c-8d2c-daa823d49d8d/enthalpy_of_formation_using_hesss_law_lab_answers.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_cfe8c7b0cb8f4b4b902bd8ec5d845528.pdf?index=trueIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_8e2133a632784f8c9314df911eb82eb1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da8f3e58-82a6-438f-a076-df30f6aa8b64/pofilufaze.pdfIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_2e2a7a286490409bb69eb2f2f2a3ce75.pdf?index=trueIn PDF document text
    • http://xewipevi.rf.gd/bilajajamarilonefamofido.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 4656 bytes
SHA-256: e337e8aac5f3a0589b7c09bdb36d35727c3e1deeb9de44beb4d18e1067aad99f
font_01_sfnt_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 10636 bytes
SHA-256: 7b6bf435dac2a2841667b83033b94dbe51b34eae22beca616d4ec29ce0efd37d
font_02_sfnt_off00011b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B88 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378