Malicious PDF — malware analysis report

Static analysis result for SHA-256 6080518d6d8fb86f…

MALICIOUS

PDF

108.5 KB Created: 2021-04-04 17:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 71d0887cde11ffbfb2f39f6b473093cb SHA-1: 6b8d6f2817aa796a6ecd591ed04cef3d204f4b22 SHA-256: 6080518d6d8fb86f1af0e661c96b976232c11ef6370a7a2d7a3d4468b532923b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one specifically pointing to 'resalured.ru'. The PDF structure and the presence of embedded URLs suggest it's designed to lure users to potentially harmful websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://resalured.ru/award?keyword=building+control+act+1990+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444358/normal_60178711e01e1.pdfIn PDF document text
    • http://sweetygirl.club/how_to_change_the_code_on_a_schlage_keypad_door_locklriql.pdfIn PDF document text
    • http://myfavoritesun.xyz/motion_in_a_straight_line_worksheetq9gjs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_601bc54e6369a.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxikotimux/ia0q9Ng/57414023006.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/c7bYPan/8260543347.pdfIn PDF document text
    • http://ighelpcenter.xyz/linksys_ac_1200_wi-fi_extender6uyz8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477877/normal_5ff41df36ecd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_6051a5bede881.pdfIn PDF document text
    • http://nextauto02.ru/655944969499vf4q.pdfIn PDF document text
    • http://summer-italy.fun/how_do_you_clean_infrared_grill_grates0zrjw.pdfIn PDF document text
    • http://natur-green.fun/muzelalanavajebumolospud43.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/4616715908805sgx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476751/normal_6007b676ba46c.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/jhjaghy/76424541957.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/7041fe31-a6dd-4406-ad35-70be036eb6a8/62631312638.pdfIn PDF document text
    • https://51364a6b-283d-4537-b9df-48522fd8faf2.filesusr.com/ugd/921180_b65d432dc1624822a56d278acade1a03.pdf?index=trueIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_17173173dc914384a7052ee542559fa9.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_5823507a29f2472ca1c81a517dc098ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d670fd1-a1d1-4d21-bda2-9a316914b8da/macbeth_reading_comprehension_questions_act_2_answers.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_9bb926a6e4004f2fbd0f036db47d4690.pdf?index=trueIn PDF document text
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_188c709aa3264c3c9499ad3c7ad21394.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8b3798e-bd44-45c2-96fa-dcafbe7b30e4/how_to_reset_roav_fm_transmitter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a3f142-6fba-4b35-ae9b-577ecefb85f5/lujipomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2491c5d3-3117-4ba2-a7e9-b73915926bc5/penoxataruwi.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_off00016bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD2 5544 bytes
SHA-256: f1d68155437c9c6b7e965fe4f3ae0c44c34c425c0589119cff928e69a986885f
font_01_sfnt_off00017ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EC3 11216 bytes
SHA-256: ed811f674b269e2125eb3e68367972a5683b767ee3048c421f93dac4d37ad47e