Malicious PDF — malware analysis report

Static analysis result for SHA-256 268ff2ffd545ab60…

MALICIOUS

PDF

69.3 KB Created: 2021-04-01 04:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 683aa83b29d95fced7150dc97d634f1d SHA-1: 270e92a7cfab03a1bd8a2cd7a27c6b9c1d5a1776 SHA-256: 268ff2ffd545ab60237b8de04dccaec5ceed1d1d8b69e2ee3982aafd940a69c2
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=passive+voice+different+tenses+exercises+pdf PDF link annotation
    • http://fruit-ital.space/38907401646y5vql.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/1820323.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://begdas.fun/73079861911eyktl.pdfIn PDF document text
    • http://aires.fun/87764209945nb002.pdfIn PDF document text
    • https://siwuxamafovad.weebly.com/uploads/1/3/4/4/134489720/sazejirupegerimu.pdfIn PDF document text
    • http://newsportstechnology.ru/american_sniper_funeral_song_sheet_music4agag.pdfIn PDF document text
    • https://xizavuxovom.weebly.com/uploads/1/3/3/9/133986710/katefamagagud_xovalen_fubezalulipig.pdfIn PDF document text
    • https://kuribigewisowe.weebly.com/uploads/1/3/4/6/134688213/bd578ca1b22af1.pdfIn PDF document text
    • http://busurman.space/12511026230og6ly.pdfIn PDF document text
    • https://girusidopot.weebly.com/uploads/1/3/0/7/130738876/7905718.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/38b6dbf5-28d7-4063-8046-edb48f370353/david_klein_organic_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11609637-54a6-4f43-9119-61b0095369f8/toy_scale_size_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/abstract_algebra_john_fraleigh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75cbd25d-3808-4634-ba28-f0c933747ad2/shark_lift_away_true_pet_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/informacion_carreteras_cortadas_alicante.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/surprised_by_joy_cs_lewis_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f5ab2f-2755-42ee-9962-e8ba2a023279/24736281302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/968df494-d22d-455e-b0e3-e10c782bcedf/como_saber_se_eu_realmente_quero_terminar_o_namoro.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/ingenuity_cradling_bouncer_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c319e19f-7eab-4149-8bf3-46d340726ece/visisadar.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/18099630911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4748acb-1281-453c-bbb5-b83ce8c3ff66/72435251471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad0e4eb-572a-49e9-8444-3d3af8587002/74955683114.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_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 5244 bytes
SHA-256: 30aba1813052e43db857c367aba21e8dcab1528c4426febe95fdb7504ac37868
font_01_sfnt_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 10336 bytes
SHA-256: 95c1a06ed469807ad657d45407ef022b72aad644343fb4fd23fa2362968c85c4