Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca32f45c017d02e…

MALICIOUS

PDF

81.6 KB Created: 2021-03-29 23:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dc83cfae00badf800f2ebe182de80a6 SHA-1: a3f3e2782b82c962b85a8c9df5027463f8ec2dce SHA-256: 0ca32f45c017d02e94d9e2b16cda415899aa2c26bf2ab44ccad1810a11a7b0e5
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body's content about car battery replacement is a common lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://nipisod.ru/strik?utm_term=how+to+replace+battery+in+2013+dodge+avenger
    • http://digitalcalakk1.xyz/africa_toto_keyboard_solo_sheet_musicdt8sd.pdf
    • http://iblack.space/ferraillage_dalle_pleinekbqg1.pdf
    • http://sibuvre.com/bivobixeja1hmh.pdf
    • http://lefavapexusa.iblogger.org/spiderman_1_game_free_for_android.pdf
    • https://cdn-cms.f-static.net/uploads/4499972/normal_603e91d59fa0b.pdf
    • https://cdn-cms.f-static.net/uploads/4495684/normal_6032c186e21e5.pdf
    • http://xviiivbgz.com/dalukakunolotugpjp0q.pdf
    • https://cdn-cms.f-static.net/uploads/4408463/normal_6023cc23e3a85.pdf
    • http://medicinfo.online/1991_chevrolet_s10_owners_manualqlfhy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_b2fc7f105c134765b267b97a8dfd45dc.pdf?index=true
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_47efb8afbcca41b1bdd1462ac9924faa.pdf?index=true
    • http://mexexumekevuk.rf.gd/samsung_xpress_m2835dw_wireless_setup_mac.pdf
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_c50e2358af2a40a9a3fe5f01d3036468.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7d6ab607-8d6d-497e-ba03-8227999f794d/98729355015.pdf
    • http://paxugevobudutis.epizy.com/the_queen_of_the_damned_book.pdf
    • https://uploads.strikinglycdn.com/files/7a6e1e63-e318-4605-845c-a0813f201056/sobetoweka.pdf
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_77943489ceef4098993fc62c34b4ecde.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d991b114-4190-4bb4-acf6-e65f7f470001/23773018389.pdf
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_93d2e118ee594f71a89781fbb96710bd.pdf?index=true
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_1031bd1bac0a468ea427268c14f09c15.pdf?index=true
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_95063ff9a9e5423eb75de725d307aa6b.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010004.bin
aafc67b8437d4bd8280c45b87d8d7e2f2740a67fb93a719264ed701839d70d70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 5908 bytes
font_01_sfnt_off00011446.bin
3ab4c90507155545bb3348a2d5ac2282b8c384f9035f156e3442f707f173fa74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11446 10724 bytes

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