Malicious PDF — malware analysis report

Static analysis result for SHA-256 a729c63bd809d54d…

MALICIOUS

PDF

69.3 KB Created: 2021-02-26 18:35:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ec3a9574b1390f38da61b563ed3b451d SHA-1: fed47d1ddf2c65f4120b3ad38baf2defc7cb00b8 SHA-256: a729c63bd809d54d7a7b7e05ba82de2e1eee1fdac80ac5a37a997a4e7b3d6355
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. One of the extracted URLs, 'https://baarspo.ru/wix?keyword=asus+x502c+battery', indicates a potential lure related to computer hardware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/wix?keyword=asus+x502c+battery PDF link annotation
    • https://keguvetazako.weebly.com/uploads/1/3/4/7/134702613/8314629e2879.pdfIn PDF document text
    • https://wizamivakujeji.weebly.com/uploads/1/3/4/5/134526499/d9c9effc163.pdfIn PDF document text
    • http://chategratis.online/2166665397hastb.pdfIn PDF document text
    • http://vowogibex.22web.org/mx_anywhere_2_software.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/what_causes_the_seafloor_to_spread_apart_at_mid-ocean_ridges.pdfIn PDF document text
    • http://lotsmen.com/how_to_use_adverb_of_time_in_a_sentencezebuo.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/38641716803.pdfIn PDF document text
    • http://infonewstravel.com/67748737826ifetw.pdfIn PDF document text
    • https://dubezotamepaloj.weebly.com/uploads/1/3/5/2/135297843/a7f373a80.pdfIn PDF document text
    • http://liwenodubabirib.iblogger.org/megolesukananigerumiseje.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/matonagib.pdfIn PDF document text
    • https://merudaxesu.weebly.com/uploads/1/3/1/3/131383629/roruduxuloba.pdfIn PDF document text
    • https://bedapidipofawif.weebly.com/uploads/1/3/2/7/132711979/4548321.pdfIn PDF document text
    • https://tunogurepuxi.weebly.com/uploads/1/3/6/0/136054619/pigugoxerirurakukera.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/U3ifiha/tupoxir.pdfIn PDF document text
    • http://dekagexagupeje.iblogger.org/angry_birds_go_apk_for_android.pdfIn PDF document text
    • https://pesadosopovito.weebly.com/uploads/1/3/4/2/134235692/xividapijolepuwevuzu.pdfIn PDF document text
    • https://mufixedak.weebly.com/uploads/1/3/4/6/134602267/disiveti-losabiwabimili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/melexarerimefan.pdfIn PDF document text
    • http://joxugodeluda.rf.gd/can_you_build_legs_with_bodyweight.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_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 5460 bytes
SHA-256: afb698d49a2ad0ad0f9e6e5095fa594424adc2935ddaf644e6a3bef0ffecde60
font_01_sfnt_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 10320 bytes
SHA-256: 97aa8452b8dc551593bdf6440afa14deb605cd2e07d91a2e5d4ae98ff0ba809e

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