Malicious PDF — malware analysis report

Static analysis result for SHA-256 6561611c9f9cc040…

MALICIOUS

PDF

79.4 KB Created: 2021-05-15 16:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8b49c3aeb0075b7acf5a5c3288112abe SHA-1: 9e295465e8d0c907b66236a095fd14da0fc83c4a SHA-256: 6561611c9f9cc0408222f378ff3018101d4331974d378e7d1b7847450b28c8be
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pelibifir.ru/strik?utm_term=carrier+edge+pro+thermostat+manual PDF link annotation
    • http://instahelpforbusiness.com/9813149947qiv45.pdfIn PDF document text
    • https://denagivar.weebly.com/uploads/1/3/1/3/131383646/xiredujakuzufo.pdfIn PDF document text
    • http://drenajkrasnodar.ru/tajamizivogarezotigf15kq.pdfIn PDF document text
    • http://getcabinets.xyz/lirek2aukj.pdfIn PDF document text
    • http://azules.ru/2185873671168api.pdfIn PDF document text
    • https://cdn.sqhk.co/pixukinoma/xhej0Xh/celestial_equator_meaning_in_science.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/Ohhhihj/lujarasotaza.pdfIn PDF document text
    • https://ninijaliwejito.weebly.com/uploads/1/3/4/3/134350726/3513937.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/cij40aK/speak_to_the_manager_haircut.pdfIn PDF document text
    • http://plsale.pro/vunedufosifogijuvugisa03qh0.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/dekozunezobafiripizi.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/jih0jbf/club_car_high_performance_engine.pdfIn PDF document text
    • https://vonulimuwudepaf.weebly.com/uploads/1/3/4/1/134131723/b7779.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_4e9aa90836e7410eaf7aa899120db46b.pdf?index=trueIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_a582209b956d4761ac42416c174d36ff.pdf?index=trueIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_4c43d8f843834dedb9663e421d7f8980.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4372544e-e03e-4a14-b44a-6ee1dccc4994/what_is_the_best_baby_pack_and_play.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff323ce3-91cc-4963-9768-84aa6d3b041b/inkscape_software_free_download_for_windows_10_64_bit.pdfIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_e96c1fffb56b416e95f74a61056ae264.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_e927677c342f46a6b967401627b045c0.pdf?index=trueIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_fdd117fa1a504ceb9ee45b6bf1297a21.pdf?index=trueIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_71993cccc1324b39801f03bd9418332e.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_f62f533d8bab4de99e30ec95d0a1bb17.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_725092facd404a52b9358e7fc4826822.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8bdd195-c822-4c0a-bf09-84828828838c/wiwigazojaxamuwalalowofoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1c50c0-652e-446e-b05c-9c6baa915c33/three_billy_goats_gruff_scholastic.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_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 5280 bytes
SHA-256: b4e14eb1b8fb3ba46fd008c9450d4d103a96c99899c747b1a7a0aa784e9c5258
font_01_sfnt_off0001070b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 11688 bytes
SHA-256: e5da79d6e390516fb8ef0049bb113bec248884a2b7a536f8db418aa2eb2b5e5f