Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ec2eae1fe8fd3c…

MALICIOUS

PDF

80.8 KB Created: 2021-03-23 08:34:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b52e221101d7fe18aeae8dc2d7e1b62a SHA-1: d9abad2f3fa96e20f64a69777a2658e24c631768 SHA-256: c7ec2eae1fe8fd3cc8303592823d8879007b8a6ba1b5b84e2e0019b35bb39770
126 Risk Score

Malware Insights

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

The PDF file is classified as malicious by ML and ClamAV, and contains numerous embedded URLs. One prominent URL, 'https://pelibifir.ru/strik?utm_term=first+alert+smoke+detector+9120b+owners+manual', suggests a phishing attempt disguised as a product manual. The PDF's structure and the presence of many links indicate it functions as a link farm, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/strik?utm_term=first+alert+smoke+detector+9120b+owners+manual
    • http://gopudumimipabol.mypressonline.com/brucellose_traitement.pdf
    • http://rosativiwam.mypressonline.com/bonus_act_amendment_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4463010/normal_60392b65db63c.pdf
    • http://nalodorepuwag.getenjoyment.net/tonevetoluraxamimizili.pdf
    • http://mabojexovepa.22web.org/fozutefeseleromevari.pdf
    • http://ruvejufagofo.22web.org/xukexapuzamumodamosiporis.pdf
    • http://bukudix.getenjoyment.net/biology_gcse_revision_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4463824/normal_602fa4160f354.pdf
    • https://cdn-cms.f-static.net/uploads/4450257/normal_5fda80edd7bb2.pdf
    • http://jetinaxisodew.mypressonline.com/histoire_des_cathares.pdf
    • http://dabinepoj.mygamesonline.org/rutuxewozidokoxur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://s3.amazonaws.com/bipepezuwed/fudulijevirebanududure.pdf
    • http://juxawewoguseku.epizy.com/67963691725.pdf
    • http://dimakadube.epizy.com/86796594463.pdf
    • http://mafuwiwoxosom.rf.gd/how_to_have_a_successful_market_stall.pdf
    • https://s3.amazonaws.com/nawuvud/review_gopro_hero4_black_vs_silver.pdf
    • https://s3.amazonaws.com/vuxirefare/behavioral_approach_to_information_retrieval_system_design.pdf
    • http://kavibajegis.onlinewebshop.net/how_to_warm_up_starting_strength.pdf
    • http://sarososibi.rf.gd/free_casino_games_slot_machines_no.pdf
    • http://tutunod.epizy.com/fulurerenewuviguvuribatiz.pdf
    • http://mojigoka.atwebpages.com/88587213543.pdf
    • https://s3.amazonaws.com/xalasawu/autocad_architecture_2014_tutorial_for_beginners.pdf
    • http://misezameliza.rf.gd/logic_and_contemporary_rhetoric.pdf
    • http://jemileti.atwebpages.com/addition_and_subtraction_of_vectors_graphical_method.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea39.bin
583770004139f21e5c1ff1d426a1dcdaa1a20aed9bcc1f1738afec08c3815960
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 5820 bytes
font_01_sfnt_off0000fdf3.bin
488ffee5e9c33bcc1f3f00aec749f35977d0cdd209ffadaee35194d66ecc177d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF3 6148 bytes
font_02_sfnt_off00010dd3.bin
5206315178af0224ba26a43cb7c0f7a0aca73bce88bd8fd833ddb75c1b1015c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 10916 bytes