Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62955964b4e5052…

MALICIOUS

PDF

76.7 KB Created: 2021-03-28 11:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: df19401d07575498290c1bfe40871065 SHA-1: a15e5e5a29ce85928cb9cd7f5e715bd83b28d7ea SHA-256: d62955964b4e50523b38ebb977d649000dfc4792554f7d7414e84b4b748e6acc
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=fancybox+open+pdf+in+iframe PDF link annotation
    • http://mobufuwiwid.medianewsonline.com/55510506631.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/hdPFVjg/13217468876.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/riwafifulokewijiguzegusa.pdfIn PDF document text
    • https://cdn.sqhk.co/mapiwoda/dH09ZHE/past_future_mp3_song_download_djpunjab.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/hegethF/poxovesid.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/Zcjegjb/applock_application_which_country.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/beicjbH/iron_maiden_legacy_of_the_beast_toronto_setlist.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405459/normal_600e9c9d38c55.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/PijQgi4/37236866771.pdfIn PDF document text
    • http://retoxen.mypressonline.com/tigexasel.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/hsYhipj/44788696660.pdfIn PDF document text
    • https://cdn.sqhk.co/purorenutuw/pjE1heQ/vitamin_shoppe_cbd_oil_garden_of_life.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378831/normal_5fe03a13e0025.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/S8jbifQ/hobby_lobby_pirate_eye_patch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_41633228a65f4d3dbd8a65058387f4e7.pdf?index=trueIn PDF document text
    • http://gubadif.myartsonline.com/nikon_d40_lens_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ca817b-1d2f-4cdb-830d-9dffe2454a05/rujakowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d4a773-5c10-4001-93d0-8449229d5f34/how_to_do_exponents_with_different_bases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87efebeb-bbab-4af0-93f8-5d4a0f3ce35c/emily_dickinson_poem_hope_summary.pdfIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_023409f9fede43f6a2de5cf0ffbb4669.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE005 5064 bytes
SHA-256: a8fe44d2019a80dab60f08bf254deb13dcf9893b5d27b2dab3f1b8c793ccddc3
font_01_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 11284 bytes
SHA-256: 3870cf6d2278124da56be6717c2a13e79e985ff7b428d53004b37dca0b04bbbd
font_02_sfnt_off00011793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3