Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f541e035b94361…

MALICIOUS

PDF

81.0 KB Created: 2021-04-10 21:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92fd92cf40de91b8deb1f1f69821f386 SHA-1: 0e335192175293d64595fa747b27dec3bd80d4fc SHA-256: 88f541e035b943613ccf9bb55bb79d41bda1c582f2cc4953c50c14cc39f12f70
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/strik?utm_term=how+do+you+test+a+golf+cart+charger
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/2ef9332680f3e.pdf
    • http://tixesikixux.mygamesonline.org/lujesojilifodijulapimonas.pdf
    • http://falorilipeb.mywebcommunity.org/self_awareness_books.pdf
    • http://ridovise.sportsontheweb.net/64204440569.pdf
    • http://vizuwubifazezix.22web.org/carcinoma_basocelular_e_espinocelular.pdf
    • http://konolux.medianewsonline.com/zilutubusexo.pdf
    • http://lenulari.mypressonline.com/bupobikuwaradate.pdf
    • https://buronoveze.weebly.com/uploads/1/3/0/7/130739674/nunixif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://miwewugewu.atwebpages.com/cdc_vaccine_ingredients.pdf
    • https://uploads.strikinglycdn.com/files/99554a1c-bc61-4dc5-b650-85eee10ff7b9/zejadixakuvotejozasisanox.pdf
    • https://uploads.strikinglycdn.com/files/01ece819-1776-428f-9b07-6c7880df3946/computer_programming_classes_for_beginners_near_me.pdf
    • http://semazixiguf.rf.gd/10705497792.pdf
    • https://uploads.strikinglycdn.com/files/e54f4e9a-dec5-408c-b0e6-ad3d402b2f64/38589324683.pdf
    • https://uploads.strikinglycdn.com/files/88322d01-5ff4-45b5-a49d-4d9759139707/50579168747.pdf
    • http://jubogaju.atwebpages.com/60850556522.pdf
    • https://uploads.strikinglycdn.com/files/525035c1-ae82-4f1b-915a-d1b1bab4d2b1/verbal_reasoning_practice_test_australia.pdf
    • http://zilanun.epizy.com/namixaja.pdf
    • http://xewewiwuxadul.rf.gd/what_does_bank_check_look_like.pdf
    • https://s3.amazonaws.com/temujonuwu/50054116134.pdf
    • https://s3.amazonaws.com/paxuvagal/how_to_thread_juki_ddl_555.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09e.bin
048c6937810b401267ad24647e99078acbc3155f7a80d729e3a3c296a83749e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 5168 bytes
font_01_sfnt_off00010261.bin
f5bc6f5dba4d214c78aa4c5e4a394b29226f3af32e937c8bf3f25399b55708ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 10600 bytes
font_02_sfnt_off0001266c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 4324 bytes

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