Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c9e0c6111a7f43…

MALICIOUS

PDF

88.7 KB Created: 2021-04-04 02:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c3421d323df6ba70e2020da119e3a22e SHA-1: a48cb9c54b1cd7e75f9c2cc918d10f34f7110a84 SHA-256: f0c9e0c6111a7f43e5fb90e71f47407eaf81427ab261ca1f62e733cff853643d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, characteristic of a link farm, and is hosted on disposable domains. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature by presenting itself as a tutorial. The primary attack pattern observed is the use of a link farm to potentially distribute further malware or engage in phishing activities.

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://fokemale.ru/strik?utm_term=best+imovie+tutorial+2020 PDF link annotation
    • https://busonuvawariba.weebly.com/uploads/1/3/4/3/134355681/wigufakaberibax.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenodisoda/Ahad9jh/slitherio_mods_play_online.pdfIn PDF document text
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/0b76e1493648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448984/normal_5fe841bfcb9da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462073/normal_60623108ce943.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/hdyhhrb/the_farmer_in_the_dell.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369507/normal_5fc772b3e42e0.pdfIn PDF document text
    • http://normal-id.com/678796169149kero.pdfIn PDF document text
    • https://begafirezudafo.weebly.com/uploads/1/3/1/4/131438667/6273976.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/gajuzinumesokibar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483586/normal_60566ccf52ec4.pdfIn PDF document text
    • https://talupujepanuzan.weebly.com/uploads/1/3/4/5/134595677/zenesuf-vakes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528260/normal_5ff3824aecea1.pdfIn PDF document text
    • https://badosajag.weebly.com/uploads/1/3/1/4/131407507/nevab-tezusijopisote-viputafi.pdfIn PDF document text
    • http://obuv-kozha.ru/how_do_you_remove_a_grohe_ladylux_faucet_handle94e84.pdfIn PDF document text
    • http://cocobuka3.xyz/knights_of_pen_and_paper_2_crafting_guidesooe2.pdfIn PDF document text
    • http://waverufusufafuv.scienceontheweb.net/jefoxarimo.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/ghiPUFk/22958969909.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/bggidgj/nosofivejiruzu.pdfIn PDF document text
    • http://dsv-trening.ru/one_touch_ultra_2_meter_reviews5to1a.pdfIn PDF document text
    • http://finansi-7.online/how_to_power_hx_stompol31h.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/rokiwe-fisedujigibib.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/wulori_sujegiruwub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jowawaba.atwebpages.com/how_to_treat_your_body_like_a_temple.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 5216 bytes
SHA-256: 25a2aec660f3dd2708b7df5f8c7f0b202b7b8dd310c16ce6ea35bec23f0fb1b8
font_01_sfnt_off00011a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A86 10684 bytes
SHA-256: 296947ef52b72cc2978bdd42c068f07eccc3c8d511b80cfb9c4428c64e1ba7d8
font_02_sfnt_off00013f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F43 16388 bytes
SHA-256: 534e44c921e8acb9c8e993207df297c85ca6c672af4c6174c05b3ca24a170572

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