Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ddadc8717e6755…

MALICIOUS

PDF

75.3 KB Created: 2021-05-09 15:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 827f1ef05cf9ad4b08e0590bb7e4aa8c SHA-1: cb950a16fdd034ee87154d47545658be21e00ec5 SHA-256: 31ddadc8717e675508154eeb8cc3c61b85129dfd3cd2ef48a82848042e38cd8c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

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://bologen.ru/strik?utm_term=what+is+pull+planning+in+construction PDF link annotation
    • http://fofiwafajelerax.sportsontheweb.net/15723759488.pdfIn PDF document text
    • http://ionatr.fun/how_much_money_did_mortal_engines_makervwof.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/52615790544.pdfIn PDF document text
    • http://gsmall.space/67223853396rbexa.pdfIn PDF document text
    • http://biggymstoe.com/savitaduneridly9m2.pdfIn PDF document text
    • http://afracheat5.xyz/purble_place_download_macabbqa.pdfIn PDF document text
    • http://alcexpress1.xyz/voice_changer_app_for_online_games_androidkiemd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bibuligo.epizy.com/a_beginner_s_guide_to_japan_iyer.pdfIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_bbb87026e4f142fab7397152509279c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/11265e6e-c806-4c4e-a530-2875011f64fa/the_sandman_book_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9982e835-e153-480e-b250-91dc23ea2228/how_to_hard_reset_neato_d5.pdfIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_be739fe2f90344e5bec110febb04ba5f.pdf?index=trueIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_73f24927e74c48d997a2cc555e5a21c4.pdf?index=trueIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_0e17d727b64b4c68855f0339eab4f538.pdf?index=trueIn PDF document text
    • http://situwosase.myartsonline.com/bolajusawojalusufajal.pdfIn PDF document text
    • http://zedagemutumus.rf.gd/guts_and_glory_ps4_trophy_guide.pdfIn PDF document text
    • http://letelexedat.epizy.com/noninexapepurelotuxojipez.pdfIn PDF document text
    • http://legujajojozete.epizy.com/35576474281.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_b164afa1c60348068e15e1910798aa2b.pdf?index=trueIn PDF document text
    • https://07bd7893-a6ec-44d5-90fe-c719e602c0bd.filesusr.com/ugd/aafaff_a5f56766ba764bc9aa2c11400765902b.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_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 5208 bytes
SHA-256: 01af0eb2d38d428f9c6156029353f509aa003eb84716cc1cd90b889e01febcb6
font_01_sfnt_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 10436 bytes
SHA-256: a7bd1aab1d0c312b39cd5fbf4d15f7d39199439793f25233c1cabf48928fa1fd

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