Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb855fe017217e0…

MALICIOUS

PDF

86.1 KB Created: 2021-03-18 01:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 783fa20e8853656f2e91cc55488ff209 SHA-1: c35df9d169efe720128ddfbb6f0f873bc6673b8e SHA-256: 3bb855fe017217e02400cbb6a1066d06d96f96b33585f11176488ce3a7a770ab
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and the presence of URLs like 'https://golowaki.ru/strik?utm_term=schwinn+meridian+7+speed+conversion+kit' suggests a lure to potentially malicious or spammy content. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly suggest an attempt to redirect users to external sites, aligning with a phishing or spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://golowaki.ru/strik?utm_term=schwinn+meridian+7+speed+conversion+kit PDF link annotation
    • http://rowexusaje.mypressonline.com/bioactive_glass_ceramics_properties_and_applications.pdfIn PDF document text
    • http://sowopedasozax.22web.org/mezakuturativirixu.pdfIn PDF document text
    • http://sushibara.net/84635368141u9wy3.pdfIn PDF document text
    • https://cdn.sqhk.co/sategexarom/otMgfN4/mini_battle_royale_2_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/dhcibjg/fajavudugo.pdfIn PDF document text
    • http://fishing-rods2.club/cinema_4d_mac_crackeado2lmas.pdfIn PDF document text
    • http://negeduji.66ghz.com/free_printable_number_worksheets_11-_20.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/65471766000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a78c2b8b-3c47-4f91-acf7-194fd77c8017/wings_of_fire_dragonslayer_sky.pdfIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_51b54c2b71894a66bd44ec5290a9ef2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece1e444-56fc-4c5f-99b0-b3f3a003627a/are_firex_and_kidde_compatible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c4162c-81c4-4e34-ba13-604dd2f8c281/98644204625.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_f2fabc93f1e144068091c1ac5fbd1205.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede0b84e-2076-4a8a-9b52-654062084a1d/vexinividafu.pdfIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_b9c86745b51245df872a75e6a3888e17.pdf?index=trueIn PDF document text
    • http://nabenejajoko.myartsonline.com/troy-bilt_4-cycle_trimmer_parts_diagram.pdfIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_48b71d2e466246189fb822773d02e356.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/325d2194-eec4-48fa-b7db-d956244d627b/real_estate_law_of_contracts_practice_test.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B3 2912 bytes
SHA-256: ca76997379172eee33085c8482c7323aa4c6490e5d9b0518affecd078e7eaab7
font_01_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 5680 bytes
SHA-256: 31ca1caac529512be0f2dd7f102933431ed9abcec37be8795f5aebd6e3d7ec63
font_02_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 12280 bytes
SHA-256: 4a324f3f80aee4d86214ab98db7121b5ecef74f9a14679cb4d45d4afa61df77e