Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b210654894a182…

MALICIOUS

PDF

71.4 KB Created: 2021-03-29 01:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 935907eaf04f2fd35a2da22251f7a880 SHA-1: e08ffcd021ac6c8297ca3510ed83669c8805d6dd SHA-256: f3b210654894a182b087f57b8605ac3e89db384f540b6561db1d36ed050233b5
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a phishing or scam attempt. ClamAV detection and ML classification further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lead users to malicious sites, likely for phishing or malware distribution.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/aws?utm_term=sony+icf-cs15ip+price PDF link annotation
    • http://springwin.space/44048854258ai9bb.pdfIn PDF document text
    • https://xopibazoditovo.weebly.com/uploads/1/3/1/4/131406935/3811584.pdfIn PDF document text
    • https://guxitokos.weebly.com/uploads/1/3/2/6/132681611/burux.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/puzzle_mania_book_oliveboarddke8a.pdfIn PDF document text
    • https://palavelo.weebly.com/uploads/1/3/4/8/134891967/xawisegev.pdfIn PDF document text
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/0948d891d.pdfIn PDF document text
    • http://zipogagu.iblogger.org/semufemivesemoba.pdfIn PDF document text
    • https://xizadububexo.weebly.com/uploads/1/3/4/5/134595199/kawabekakujop.pdfIn PDF document text
    • http://dkmz3.club/download_avakin_3d_avatar_creator_mod_apk5xsmv.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/ditiruz/vunozazizenol.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/how_to_set_heat_mode_in_hitachi_ac.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/chamara_weerasinghe_all_songs_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/ad_hoc_reporting_in_cognos.pdfIn PDF document text
    • http://zimemotom.rf.gd/pidagazajoxabejunotipusus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2fa0709-7f0b-440b-8817-d5a22ceb721f/vampire_diaries_cast_season_8_episode_1.pdfIn PDF document text
    • http://mibavened.rf.gd/59397825829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c96863-0487-40c1-9520-275437ee30e9/vabarekamenofibi.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/34432924880.pdfIn PDF document text
    • http://fomabobas.epizy.com/backend_json_format.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/latest_guidelines_for_diagnosis_of_diabetes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a57a2e2-c25d-4892-932c-40f032e96a78/kiwibedarotutib.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/movie_free_app.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/lorosetarewarupegevide.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_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 5180 bytes
SHA-256: 8be0c6feb4c64f4df63e40132ab998803531e1d0e0a2ff1b04b0f1cac6f217c3
font_01_sfnt_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 10580 bytes
SHA-256: fe005b51164954eeb1344cf949ef06520d3635c7c8a4dbccea337bdedfaf4158