Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f865eb2832cf125…

MALICIOUS

PDF

81.3 KB Created: 2021-03-30 08:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2fd96c86fdfebd9b89821de8c7a1cc38 SHA-1: 26dfdd0c533bb1f3bce5a387f8b4f351cf2c1ef7 SHA-256: 5f865eb2832cf12551d74c8a7ed68b2d4e5f4b79ce4a49bc5fcdf2043c21ade4
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 is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to malicious sites, likely for phishing or to download further payloads.

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://ponafet.ru/strik?utm_term=graco+nautilus+3+in+1+booster+car+seat+manual PDF link annotation
    • http://fb-ig-copyright.com/how_to_sample_with_a_random_number_tablebvgtd.pdfIn PDF document text
    • http://good-production17.site/vapasisopufezave9f7dw.pdfIn PDF document text
    • http://idealicacolumbia.site/firububeturexuzasegajo9kst9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473916/normal_5ff7a75d1a5c3.pdfIn PDF document text
    • http://leqqurint.online/12944566140myibe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369166/normal_6002b81ad21ce.pdfIn PDF document text
    • http://giocodigital.fun/630600362766um8k.pdfIn PDF document text
    • http://sudoniwitexife.22web.org/78719572286.pdfIn PDF document text
    • http://haifaiv.ru/banodezotajelokjuwl.pdfIn PDF document text
    • http://ericksandoval.com/sc-1000a-car_battery_charger_manualxmuhw.pdfIn PDF document text
    • http://islemleriniz.org/diaphragm_pump_rentalhruxx.pdfIn PDF document text
    • http://vpntop.info/mnecraft_1.5.2_indirkijzg.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/61409528013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394082/normal_5ffc9cda8fb50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_6049cc22cc149.pdfIn PDF document text
    • http://jumpfs.space/zaferolinatiwajaggdvd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://besevinoferoza.epizy.com/25293921580.pdfIn PDF document text
    • http://leliruwe.epizy.com/antonyms_english.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/ringkasan_amandemen_uud_1945.pdfIn PDF document text
    • http://fitewamulifat.epizy.com/enter_shikari_the_great_unknown_lyrics.pdfIn PDF document text
    • http://jejomozukiro.rf.gd/57672490497.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_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 5332 bytes
SHA-256: 53ea556263b62db4e63b6fd4eb8d1d197acb1b460b4279502365835f121e5111
font_01_sfnt_off00011383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 10640 bytes
SHA-256: ddb3ee8f28c8e8a0bfe0ddd047de6139f68ba2ad7c2ec5c654e12975a25c4137

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