Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfd429877683bbe…

MALICIOUS

PDF

91.8 KB Created: 2021-03-03 16:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 08ab6bcaee526e7c0a6f06a13e56ecbd SHA-1: e6278923ee265fcea6e0e33d0dbc0aba07c1fb3c SHA-256: fcfd429877683bbe423140aaa9527971d05009bfc84bf1057d75362a7019c7e1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as a phishing trojan. The document body, though heavily obfuscated, contains text related to a 'Final Fantasy 7 original strategy guide', suggesting a lure. The embedded URI points to a URL that appears to be a redirector, likely leading to a malicious payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=final+fantasy+7+original+strategy+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5ffb7124b6d65.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/gkc8TkE/starfall_february_2011.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/dkjegix/snake_in_toilet_bowl_prank.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_601afffdba973.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/agjhjhi/swat_costume_womens_spirit_halloween.pdfIn PDF document text
    • http://letilemugemin.66ghz.com/pofufip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484364/normal_5ff81b1024b73.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/pack_n_play_mattress_pad_walmart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_600c1f6d88104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_6039b9eeed80f.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://s3.amazonaws.com/mexavofezoxi/elso_va_ecmo_guidelines.pdfIn PDF document text
    • http://mifedisiso.atwebpages.com/15866600847.pdfIn PDF document text
    • http://luvenawow.epizy.com/star_trek_movies_new_ones.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/89671720181.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/kisulodobejodazizelodag.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_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 5096 bytes
SHA-256: 655c6b6218cef13a3dd29b64a84ce9de94c2e0f33015bc9275ef919e8866e9bf
font_01_sfnt_off00012d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4B 11692 bytes
SHA-256: b14951b3d69188f0ae199e6748012a3527b5dc0222b6fc08b79fbedb9484a518
font_02_sfnt_off000153c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C1 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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