Malicious PDF — malware analysis report

Static analysis result for SHA-256 4739d07eaaa767df…

MALICIOUS

PDF

74.5 KB Created: 2021-05-01 01:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c0553d41e162f7e297c474822a416737 SHA-1: b139721c0e00f83c68eef60afd0d676a1503d72f SHA-256: 4739d07eaaa767dfb5af9001396778b3f15b32e3a85009cf2ee885cf004bffd5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/strik?utm_term=hunter+fan+remote+control+transmitter+uc7848 PDF link annotation
    • https://cdn.sqhk.co/konajera/8cihgh4/32295897158.pdfIn PDF document text
    • http://ipoteka.net/16271038035wdrs1.pdfIn PDF document text
    • https://cdn.sqhk.co/ligilitojob/V5Difgi/limanadenerigotesom.pdfIn PDF document text
    • https://cdn.sqhk.co/tijanukubo/ieyPijr/drift_racing_car_driving_simulator.pdfIn PDF document text
    • https://cdn.sqhk.co/xexerekija/e5Yhjef/hovercraft_build_fly_retry_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gilevetu/vLYigib/rc_race_car_stores_near_me.pdfIn PDF document text
    • http://wildboost.club/3747845828fqljo.pdfIn PDF document text
    • http://nigasheff.xyz/26268731723ejngf.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/02uZ3Ac/color_by_number_multiplication_fall.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/geI7Uhf/car_crash_yesterday_california.pdfIn PDF document text
    • https://pabaxugu.weebly.com/uploads/1/3/2/6/132695470/6728364.pdfIn PDF document text
    • https://cdn.sqhk.co/nezipumosot/fjjgjHL/tebuburaxuvisibisimin.pdfIn PDF document text
    • https://cdn.sqhk.co/ninilevikod/eEjdeU1/investigatory_powers_tribunal_annual_report.pdfIn PDF document text
    • https://rojanekawuveruj.weebly.com/uploads/1/3/1/3/131380666/55e2a1298c6a5.pdfIn PDF document text
    • https://xorurilij.weebly.com/uploads/1/3/5/3/135325910/reduberupitigiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/lupejatuwi/hh0ijdw/3d_virtual_pinball_machine.pdfIn PDF document text
    • http://khanapoorti.com/ziperezuxpdb5.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/baCdAru/25617115956.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/waliruwa.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/que_es_el_sistema_inmunitario.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/wall_street_prep_financial_model.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_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 5352 bytes
SHA-256: ec761b138b350e39349e26ad9a2455c31801e722af324f17861be0a83da52aa2
font_01_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 11556 bytes
SHA-256: b11e8f6660f2ae2faa13b9bbdbda467e34e3108a124710133947ea037203bd56

Open this report in the interactive analyzer, or submit your own file for analysis.