Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b1f5e9971d91ca…

MALICIOUS

PDF

70.3 KB Created: 2021-01-20 15:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 542f7c94233e68612322f04d0f808109 SHA-1: 5bf762f4c5a7ec684959da4534d3fa04dd86b61c SHA-256: 74b1f5e9971d91cab2d83d2728d3472b0262f5f8eafd250f01e573e3b9577d98
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm heuristic, suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9615

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://trafftec.ru/wb?keyword=vitamin%20d%20deficiency%20treatment%20food PDF link annotation
    • https://cdn.sqhk.co/gasariba/Mjjhhcu/digidesign_mbox_2_mini_driver_mac_mojave.pdfIn PDF document text
    • https://xapewagese.weebly.com/uploads/1/3/4/3/134314981/jiwebevidu-ledirikitafu-jekave-bikapeveb.pdfIn PDF document text
    • https://site-1206062.mozfiles.com/files/1206062/76278787991.pdfIn PDF document text
    • https://cdn.sqhk.co/pumurugo/ggDifjf/reposteria_definicion_diccionario.pdfIn PDF document text
    • https://site-1206392.mozfiles.com/files/1206392/37917937900.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/hJo6ibE/cryptocurrency_stocks_on_robinhood.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/xoxaneral/asuran_songs_bgm_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/les_fleurs_du_mal_english.pdfIn PDF document text
    • http://karajifaderiwow.epizy.com/pixageraduketo.pdfIn PDF document text
    • http://fefomuk.epizy.com/6917098979.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/android_auto_app_apk_mirror.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/numuzukijumosi.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/aashiqui_2_video_song_mp4.pdfIn PDF document text
    • http://verejepaw.epizy.com/telazi.pdfIn 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_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 5024 bytes
SHA-256: e884ebb10f298780d95685c534979ce0aa318a7098392bff8b54f12ed97505b9
font_01_sfnt_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 10696 bytes
SHA-256: 304135915f97e7fe751ddd3b5edf28e6a3f8840581679791a9a17777518f193d