Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb0450c7444a09b…

MALICIOUS

PDF

90.0 KB Created: 2021-03-19 22:25:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1aa9eb1817c8817670d199fcf0124123 SHA-1: d5cd5c70795309d16921b2e32752f38008bc555c SHA-256: 5cb0450c7444a09bd24dbf4cedd1819c81c185f38976cfeba3c8f26f12754ea1
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 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=hp+laserjet+1320+printer+price PDF link annotation
    • https://fubexomufepa.weebly.com/uploads/1/3/4/8/134850999/ad32b1c29.pdfIn PDF document text
    • http://bukapim.mywebcommunity.org/58519370019.pdfIn PDF document text
    • https://mawikimame.weebly.com/uploads/1/3/4/2/134235565/zifasebuvopuli-sejiviligi-kepusep-pabaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/leguzufaju/djgqjjf/3d_animation_songs_free.pdfIn PDF document text
    • https://cdn.sqhk.co/saxamabewido/hidKvjb/fujovanulinoso.pdfIn PDF document text
    • http://tevaruv.sportsontheweb.net/zulunufaxifijikodoj.pdfIn PDF document text
    • https://mirijanonukuzo.weebly.com/uploads/1/3/2/7/132740352/zobosobegax.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/hjchffv/tavatefoturusekukini.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/jd5geij/friday_the_13th_killer_puzzle_switch.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/17672616987.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/R0Fheii/hopeless_3_dark_hollow_earth_apk.pdfIn PDF document text
    • http://jolilibigir.22web.org/what_does_easy_peasy_mean.pdfIn PDF document text
    • https://mozevosiku.weebly.com/uploads/1/3/3/9/133999333/2660ea4c.pdfIn PDF document text
    • https://bimidofun.weebly.com/uploads/1/3/4/4/134460432/1623444.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://uploads.strikinglycdn.com/files/73775598-e8c0-46c9-8cb9-4c6e64cb93df/taco_bell_black_bean_burrito_calories.pdfIn PDF document text
    • http://wuwokumafinu.epizy.com/gre_verbal_practice_test.pdfIn PDF document text
    • http://bajaxugezozego.rf.gd/infamous_paper_trail_guide_part_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef66be24-f04c-4169-bfb6-4bd91b705410/wibuboguru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61c64ab-0d6d-47d5-aec6-4af4385ac0c2/1328957891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83ebcc0-5384-46ce-9161-cf1070d4680c/2363011584.pdfIn PDF document text
    • http://revixano.rf.gd/the_tragedy_of_great_power_politics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c1359d-2b82-4131-a347-eb1a682a44ce/59239191777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07331ff5-3ccb-4366-bd1a-fcddff0862df/razefopix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48f2eb60-a9ed-4417-b60e-b7f4e9faa100/88304869050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2abbfdd3-09d0-4673-97df-93d68328b59f/badger_100_insinkerator_instructions.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_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 5132 bytes
SHA-256: b408ba1f086593dc365a7e791863593a15767464058beb50a821ce46a3770399
font_01_sfnt_off000126a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A3 11152 bytes
SHA-256: ca9ad2791e4e179ec539a25b0f74a79dcf90f0a6924ef512e9a3bd1e9d9c7e84
font_02_sfnt_off00014c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C34 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333