Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a16144bc2e406f6…

MALICIOUS

PDF

83.0 KB Created: 2021-03-16 11:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27bc56639352b50405f8a21ea25f6696 SHA-1: 545c3fd7b336927dae078d2a3793c9db7d77ef5d SHA-256: 3a16144bc2e406f68a6f17d58dfa6d4b96360988245babe126ecc4453757af34
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Final Fantasy X boss strategy' and 'wkhtmltopdf', indicating a lure to attract users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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/wix?keyword=final+fantasy+x+boss+strategy
    • http://trychambre.xyz/57941928865q9rht.pdf
    • http://mastericy-chistoty.ru/205868261941ur2w.pdf
    • https://static.s123-cdn-static.com/uploads/4383450/normal_5fc896ba757a0.pdf
    • http://tafuxasomup.getenjoyment.net/gogusitavaxinoxojolofugij.pdf
    • https://cdn-cms.f-static.net/uploads/4421944/normal_5fda24230b2e5.pdf
    • http://effektzhizni.ru/nikon_fg_film_manuallc9m0.pdf
    • https://static.s123-cdn-static.com/uploads/4384320/normal_60004ecf97a42.pdf
    • http://uablog.site/introductory_textbook_of_psychiatry_downloadm153a.pdf
    • http://regsenatvumen.website/2164079543qechz.pdf
    • http://helpcreditscore.info/how_to_write_a_pre_lab_for_chemistryoo0wz.pdf
    • http://ver-alex.website/durewoz09f9f.pdf
    • http://lastmarkt.ru/expanding_and_simplifying_brackets_worksheet_gcse63l85.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lodumojokexiku.onlinewebshop.net/leferekepumulelefej.pdf
    • https://uploads.strikinglycdn.com/files/5bf88a3e-1cdc-4b5d-a6d7-484641ceb526/gonulipamikemob.pdf
    • https://uploads.strikinglycdn.com/files/1ed436e7-43f1-46be-8a85-89186b3c7b3a/how_to_use_omron_thermometer_mc-343f.pdf
    • https://uploads.strikinglycdn.com/files/9fa78e8d-bc6f-432b-8d58-e105200ef98c/3718612671.pdf
    • https://s3.amazonaws.com/jupoti/fabirilikaboto.pdf
    • https://s3.amazonaws.com/mefovu/abortion_law_reform_act_2008_victoria.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e597.bin
e035636109783e121f12c602b7dab897b16c618a45d734d581634a4947c8279b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 5152 bytes
font_01_sfnt_off0000f79e.bin
838ec49219739d812352427f60aef7969dd715f55c1dc4028583266c7ae7de70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 4988 bytes
font_02_sfnt_off000108a5.bin
7cc82e29f72473d59628da449b4f5f174fdefa8e7cefddc2c82de3695e9f7405		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 11260 bytes
font_03_sfnt_off00012e7e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7E 4324 bytes

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