Malicious PDF — malware analysis report

Static analysis result for SHA-256 f690d0fd98833e72…

MALICIOUS

PDF

79.3 KB Created: 2021-05-30 01:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 51236392706afb720d1c038ec9a65f57 SHA-1: 2985ec25227dab2121a81b8b761229519eaf3321 SHA-256: f690d0fd98833e72890219a397b58aee8472487018ca6a03ed1a9e07224296df
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, and one suspicious URL that appears to be a redirector. Heuristics indicate a link farm designed for SEO manipulation, and ClamAV detection confirms it as a phishing trojan. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/strik?utm_term=pes+2017+low+spec+patch PDF link annotation
    • https://zewakifu.weebly.com/uploads/1/3/0/7/130740590/3882225.pdfIn PDF document text
    • https://luvabuzizav.weebly.com/uploads/1/3/5/2/135294148/zapok-somotajirobajaj.pdfIn PDF document text
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/3df42d02.pdfIn PDF document text
    • https://pebizadovabunal.weebly.com/uploads/1/3/4/7/134711288/bibabifuz.pdfIn PDF document text
    • https://vudujetejagug.weebly.com/uploads/1/3/4/6/134674723/fenapufudozelusowa.pdfIn PDF document text
    • https://lexujimejuj.weebly.com/uploads/1/3/4/2/134265975/26d72a17e5f4f.pdfIn PDF document text
    • https://pudawiwut.weebly.com/uploads/1/3/5/3/135342926/057f7.pdfIn PDF document text
    • https://satisetuxa.weebly.com/uploads/1/3/0/8/130813646/8855030.pdfIn PDF document text
    • https://kimivatebuxokas.weebly.com/uploads/1/3/4/7/134702804/0cf1be0c7a.pdfIn PDF document text
    • https://lotozuxefad.weebly.com/uploads/1/3/4/3/134316708/1693d48081e.pdfIn PDF document text
    • https://sajawibur.weebly.com/uploads/1/3/4/6/134631073/zagonaso_bukixato_manivaxup_dewimox.pdfIn PDF document text
    • https://gavaxavudo.weebly.com/uploads/1/3/4/5/134581950/66fb5f8f3.pdfIn PDF document text
    • https://lexigeme.weebly.com/uploads/1/3/4/5/134524735/3846371.pdfIn PDF document text
    • https://zodajuxos.weebly.com/uploads/1/3/4/2/134235393/e9049dd5.pdfIn PDF document text
    • https://zikibagegun.weebly.com/uploads/1/3/1/3/131398006/noxuweginixorez.pdfIn PDF document text
    • https://nofogiso.weebly.com/uploads/1/3/1/3/131398128/bikanoxexon-vuwidoj-dewobovojunu-fezisezolulam.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/4678b3c0-9ce9-4a80-9600-44544fdb0ce5/31090664743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d0356c-a01d-4739-a875-f920e2464542/essentials_of_investments_bodie_kane_marcus_10th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb2590c-b15e-4189-ac13-1eb1eac5b7c6/27738945999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8878b1d5-0991-48d4-a5a6-7321b1fc64fb/iowa_code_321.449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6186aa-caf8-4858-af7c-e72b38408bcc/foton_aumark_workshop_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1bc9fc-fa02-4b4e-a55d-6d9ef0bf450b/ziwafobisivatuxusinelum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22c90adb-1682-4375-9a88-db47ec455b61/79036563493.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_off0000e842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 2988 bytes
SHA-256: 991aedf0fd0dd49657b0b1af788d5902e0ca9741571727e475d0942e72673e1e
font_01_sfnt_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 5424 bytes
SHA-256: 326cda74dba2712fc99b3c97dce3a5d2f742eabce063fc7acff7d8113fff65ca
font_02_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 12908 bytes
SHA-256: 83e590e40103aa15999e49cea308191ce7f34bccff0c4b8547c09b73edfc08ea

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