Malicious PDF — malware analysis report

Static analysis result for SHA-256 888aa751876eba65…

MALICIOUS

PDF

90.7 KB Created: 2021-03-24 16:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 36ba025e12a90f4bab432d7c1deb2247 SHA-1: d6394a3bce72e7e43952cc5e0723ab90bed9faa8 SHA-256: 888aa751876eba65215b145fe5f37ab1b3f5880668c46c75a1fe532bc6130b99
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, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links, many of which point to disposable hosting. The primary URL, 'https://zajinet.ru/aws?utm_term=twilight+saga+2008+movie+watch+online', suggests a lure related to movie content to entice users to click through to potentially harmful sites.

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://zajinet.ru/aws?utm_term=twilight+saga+2008+movie+watch+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371025/normal_601637d5b9bde.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/wjcicje/58150707120.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/cJge7VW/entergy_texas_online_login.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/somewhere_over_the_rainbow_original_recording.pdfIn PDF document text
    • https://cdn.sqhk.co/lirotigi/a5iagdL/job_card_ka_full_form.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/atlas_shrugged_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486983/normal_6022aedc2a17d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_60519d24a70bd.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/ijhcM1I/96914013093.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367007/normal_5fde667b1429f.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/idibje2/vatisa.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/adda247_monthly_current_affairs_july_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_29118df39d654286a63edace73d022cd.pdf?index=trueIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_f333c5ecc46d4bb4b1ea65512bfe3326.pdf?index=trueIn PDF document text
    • http://xikusaduxofi.atwebpages.com/vinuden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c0e227-19ae-457f-8a1b-181dca340da5/wuxuxabexelenososobudom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ed6c48-3019-418d-9696-c910a09b2d32/84949349133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ba3f94-0f66-46a5-ac39-59c3476ce133/acido_clorhidrico_formula.pdfIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_5ea1799677c2412b8044fbfa3b83cd43.pdf?index=trueIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_7e1161bc01ae45cab7c0d1b5599ece9a.pdf?index=trueIn 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_off00012577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12577 5688 bytes
SHA-256: f295cb11cea11d6863d99cc8e3a58bbf18a1241a9b0b60d2434653b896b9b313
font_01_sfnt_off000138bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BD 10728 bytes
SHA-256: 950b7ce74f19482c8ff8fc4103626e434155d61594fb2e1c6a591a66f037f0bf