Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c7a3e4e4a75285…

MALICIOUS

PDF

81.4 KB Created: 2021-04-06 05:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dd29e3bda619edfd797abc5b8754da08 SHA-1: 6341c6015fe93d645d15515239594f2a7ad4fcb1 SHA-256: 79c7a3e4e4a7528522ce712016a2f2f267fbd588842e580c19f0252060ae0214
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=samsung+wa48h7400aw%252Fa2+filter+location PDF link annotation
    • http://instapriz.site/91877534162uhlq4.pdfIn PDF document text
    • http://copyrightsupport-ig.com/what_is_caps_for_sale_aboutps96o.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/z_score_table_normal_distribution_calculator.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/deriluduxobogu.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/carpentry_workshop_practical.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/DhHgdjb/muxujugowudamogik.pdfIn PDF document text
    • http://vezerfa.xyz/krystopia_a_puzzle_journey_mod_apki9yv2.pdfIn PDF document text
    • http://xizerunax.scienceontheweb.net/31892616887.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/the_magicians_season_5_cast_pig.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/3XXij60/orbot_vs_tor_browser_android.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/what_is_form_ssa-1099-sm_1-202177yim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_4a6de99428bb49de9659935f348a6db8.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_65142787ce0547c49f18f397a86fc5a4.pdf?index=trueIn PDF document text
    • https://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_4327a94b246047b5912cf1f2da939832.pdf?index=trueIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_39d6d3ad62f34c648558b80c78435dd3.pdf?index=trueIn PDF document text
    • https://a1104102-e7f7-498f-9db5-fd16eb5a1c84.filesusr.com/ugd/3f19aa_0e273a280a254f318bbe8682f46935af.pdf?index=trueIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_181e183d0236420dad90316409a44b33.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_91832e47845b454c82e7c52ee08f71b6.pdf?index=trueIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_067628a1f36e46d19e2ddfafe93cbc4a.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 6164 bytes
SHA-256: a625fd82dcb8b9037a8debcc1130216a9d8df7aac5a748967421916ca79cea4e
font_01_sfnt_off00011382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11382 10832 bytes
SHA-256: 4cd4b3dfbd1c9b13bd718bcf0a77ba27ba0efacd8daf5b97e27ba963673a4a63