Malicious PDF — malware analysis report

Static analysis result for SHA-256 742c238e6275dff5…

MALICIOUS

PDF

79.0 KB Created: 2021-03-31 16:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6831caedfb806ceae99a67e3b74152a4 SHA-1: 738cda73a034ee3e44b23ed82590aa7db84cf257 SHA-256: 742c238e6275dff5d190ca8b534e3cf6253cbc54d7f9c2eefcc4b8ed178c048d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to Facebook SDK and wkhtmltopdf, which is likely noise to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/123?utm_term=facebook+sdk+framework+ios
    • https://cdn.sqhk.co/xafeperale/hjVWjgT/rademesekogetuvonugiguz.pdf
    • https://cdn.sqhk.co/linotepibubi/8eRkigI/metrotex_dallas_login.pdf
    • http://samyog.ru/nilubalepimirenufulevizapir6i5.pdf
    • http://lesantyqas.online/funaxapelomutewegiwonoviw5m38j.pdf
    • http://ig-copyrightnoticehelp.com/pukagineviutl2x.pdf
    • http://denizan.com/pisenebixuzesufubawagasspyr.pdf
    • http://trokot-new.online/gisizepowalevce7m.pdf
    • http://help-copyrightviolationhelpcenter.com/dna_from_the_beginning_webquest_answer_keyqkujg.pdf
    • http://coupons2020.info/what_is_22_carat_gold_rate_today_in_ukxjph5.pdf
    • http://form-copyrightservices.com/kalekamupikututiwutepamonc18hx.pdf
    • http://vipadminler.org/ridopulisafumujurez1ghvr.pdf
    • http://f1l3download.site/pain_in_upper_back_when_i_look_upiq7qi.pdf
    • http://trelon.fun/57507961998s0lfn.pdf
    • http://whowill.ru/27749147642oo73z.pdf
    • https://cdn.sqhk.co/juxezijafoz/hgcghif/baritesire.pdf
    • https://cdn.sqhk.co/wajerewuwer/jcibHgd/project_management_jobs_charlotte_nc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://luxupovokajaf.onlinewebshop.net/difference_between_gymnosperm_and_angiosperm.pdf
    • https://uploads.strikinglycdn.com/files/672d0a88-6398-4ef4-a86e-ca560348d298/the_little_match_girl_book_review.pdf
    • https://uploads.strikinglycdn.com/files/3c274867-39eb-4ca8-a389-9552f753744a/who_is_news_now_patrick.pdf
    • http://kepawomokatuke.myartsonline.com/sharad_upadhye_rashichakra.pdf
    • http://taberadajip.atwebpages.com/48339102807.pdf
    • https://uploads.strikinglycdn.com/files/41ec7684-519c-463e-bc5f-707799144163/miniature_dachshund_puppies_columbus_ohio.pdf
    • https://uploads.strikinglycdn.com/files/5ac98071-b73d-4959-acb2-68c85ffce5d8/50427401594.pdf
    • https://uploads.strikinglycdn.com/files/52980944-1f4f-4bd2-9429-24df33a06556/how_to_gift_wrap_without_box.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f85e.bin
76edd45527b20bbee615e6a71f759ed8689257064c6b92ec0e76092470a1f402		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 5388 bytes
font_01_sfnt_off00010aae.bin
1cc7a697630fc7bae4bd58b7f0e4d2c08038df24fb59fb2fa60527b2f349231d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAE 10444 bytes

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