Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3b9ba801ba84a3…

MALICIOUS

PDF

75.0 KB Created: 2021-01-10 17:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0820c1c401cf7da677b34e52f9be1746 SHA-1: 2864e39faef29c6513d806d26f7d3289368bc1a1 SHA-256: fb3b9ba801ba84a30b0951477d5e994403d6b0e1e8b102c35d4872e62c6ded58
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with the primary URL pointing to a suspicious domain. ClamAV detection and ML classification strongly indicate maliciousness, specifically a phishing trojan. The presence of a download button lure further supports the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?utm_term=c.+g+police+form+2018 PDF link annotation
    • https://cdn.sqhk.co/reposivekow/V6Lgdjg/best_tiny_village_games_ios.pdfIn PDF document text
    • https://site-1178709.mozfiles.com/files/1178709/toilet_treasures_explore_your_toilet_paper.pdfIn PDF document text
    • https://fabegobidik.weebly.com/uploads/1/3/1/4/131437275/xekamapurozirijari.pdfIn PDF document text
    • https://site-1171658.mozfiles.com/files/1171658/17211737669.pdfIn PDF document text
    • https://site-1176222.mozfiles.com/files/1176222/wutisezajizap.pdfIn PDF document text
    • https://site-1167951.mozfiles.com/files/1167951/30077805157.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/zalisujezajaje/ek_hazaaron_meri_behna_hai_song.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/xadejipokonuma.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/mileta.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/fumamunofoxexogijisa.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_off0000ddad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 5404 bytes
SHA-256: 4f3301e167e275121b1156e9c9386a65cd233773fc67673762cc9b679774847a
font_01_sfnt_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 1936 bytes
SHA-256: a8ba320a0ac8a73a5a8cc2c47ba30bd151ec5f51af4d5ac0b9daf85eaa8f1301
font_02_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 11112 bytes
SHA-256: e0fb3469a8c2e5488720151ee23714a6c6e9df89336fc4f977b5c0d663865ae7

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