Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dad6b29e399caa…

MALICIOUS

PDF

111.5 KB Created: 2021-03-20 19:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5b66bf7fc5d95f7c919b1069e4c14d0 SHA-1: 9cdc5df013005634ec654b342456e7f6ed9c7541 SHA-256: 82dad6b29e399caa34d9ab17b49857bb8a921965be4ebf0418ee5c3f1e62d3c9
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 0.9987

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://fokemale.ru/award?keyword=quality+assurance+plan+sample+pdf PDF link annotation
    • https://cdn.sqhk.co/keropolor/iihdjeC/tazabeturobuwi.pdfIn PDF document text
    • http://kokolonesafu.getenjoyment.net/warusifunixijivomi.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/ibijcid/home_design_3d_my_dream_house_mod_apk.pdfIn PDF document text
    • http://tenopokas.22web.org/16456122430.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/73954292624.pdfIn PDF document text
    • http://nejamaranidirit.22web.org/cheekh_episode_19_full.pdfIn PDF document text
    • http://seomagnat1.online/91094648389i00om.pdfIn PDF document text
    • http://viwesisikumebi.getenjoyment.net/85122687147.pdfIn PDF document text
    • http://tendernes.ru/how_to_mount_a_reznor_heaterfsn16.pdfIn PDF document text
    • http://xanejog.medianewsonline.com/87774380200.pdfIn PDF document text
    • http://tufepuwaw.iblogger.org/magic_chef_mcsdry1s_2.6_cubic-ft_compact_dryer.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/dGOHgc3/a_little_war_2_revenge_hack_apk.pdfIn PDF document text
    • http://vibigalobonewil.iblogger.org/econometrics_and_machine_learning.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://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_91a69a65934a4b479946065b78f490ae.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_2f53b7e4f034401a9ad18783f2aebca6.pdf?index=trueIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_a353524da31b435db39257bb2aef111e.pdf?index=trueIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_475ef97786394bb6b02662507fdb2fc8.pdf?index=trueIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_49784e3277834b6db112727721b151d7.pdf?index=trueIn PDF document text
    • https://d7504aae-3d37-493f-8789-a5629a6fcc30.filesusr.com/ugd/7ca9f5_1870dff888d94fcbb17df1c34dc18a05.pdf?index=trueIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_68b0852b9cb3465aade851959aee1aa6.pdf?index=trueIn PDF document text
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_f1ec249fb23642c3b7200b44436bf78b.pdf?index=trueIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_4220af0b949a4ff18fcf6f53fa7f20fb.pdf?index=trueIn PDF document text
    • http://zikoliduxa.atwebpages.com/english_story_books_learning_english.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_off0001674d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674D 5236 bytes
SHA-256: e46bdca45f04265e035e6363c28d7c6be2629a14019e34340931fab009b4e60c
font_01_sfnt_off00017901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17901 11960 bytes
SHA-256: ab891303c41dcd024617772aa1b1b11ae3ae2b2cf8e8297c7057ff497d7e4453
font_02_sfnt_off0001a1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1A8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176