Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc98f21718265de…

MALICIOUS

PDF

84.2 KB Created: 2021-03-06 18:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a8360f0455e30696cbbdfd28f470ffc0 SHA-1: 3dcab12e7a8ef30e36551b0f51fa5491ca91ba43 SHA-256: 7dc98f21718265de26325c8f90ff2b850eec5f12d539d27d3c537a256bac51cd
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting a phishing or spam campaign. The primary malicious URL identified is 'https://resalured.ru/strik?utm_term=why+is+my+hp+printer+always+in+error+state', which is likely used to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=why+is+my+hp+printer+always+in+error+state PDF link annotation
    • https://cdn.sqhk.co/xovatagemi/40bjbjg/2nd_grade_math_lesson_plans.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/dG2ejzb/cute_acrylic_nails_almond_shape.pdfIn PDF document text
    • http://zupebupinumupo.iblogger.org/susubisafop.pdfIn PDF document text
    • http://vuvepexuja.22web.org/71119069852.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/how_to_be_a_man_quotes.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/68172099452.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/shark_professional_slim_steam_mop_pads.pdfIn PDF document text
    • http://sutixekume.22web.org/besekopexikavovagek.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/is_microsoft_project_online_free.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/naduj.pdfIn PDF document text
    • https://cdn.sqhk.co/putizimetiwe/d2tnjfP/story_maker_instagram_story_editor_collage_creator_free.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/rhjtTFk/rufus.pdfIn PDF document text
    • http://miwewumexurigan.sportsontheweb.net/define_flowchart_in_computer_science.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxarufodir/jhdqidX/microsoft_project_plan_viewer_free_download.pdfIn PDF document text
    • http://lojuxaga.mywebcommunity.org/66258885968.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/the_way_of_the_superior_man_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_b3f70265a242409da65d476b10db471c.pdf?index=trueIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/semesewexemuv.pdfIn PDF document text
    • http://dovagoxaluzof.rf.gd/53798201736.pdfIn PDF document text
    • http://xojudemavu.onlinewebshop.net/faliwulonimagowusufeb.pdfIn PDF document text
    • http://jamoxesadesoxa.rf.gd/what_is_the_cosine_of_180_degrees.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_b7b5588058724bada23e44d6f33ca445.pdf?index=trueIn PDF document text
    • http://jutejuviwolopis.rf.gd/free-_living_freshwater_protozoa_a_color_guide.pdfIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_988c13b63c214382999873d5f82b25ab.pdf?index=trueIn PDF document text
    • http://sinalowus.epizy.com/27583041458.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 5264 bytes
SHA-256: 09f6272f6404ec5ac6b3146e6b2565ba7af1ac03e3285a088f455b1ab6fadf76
font_01_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 10480 bytes
SHA-256: 48b2fb9d04df322730afce7f0b614d0f872f15391fb61f6026fa6c65ae1939c2