Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f75e39605b29c24…

MALICIOUS

PDF

92.6 KB Created: 2021-03-21 20:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0f1bf9772d9b48ae9b99c2ffbc688e56 SHA-1: 8e3c8ea2c0d195bed3d418d72393c2279d9942e9 SHA-256: 0f75e39605b29c24e008eb3315185d86751aa193e0fed8c87da0079a4036060a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm for SEO manipulation or to obscure malicious destinations. One external URI, 'https://jottigo.ru/123?utm_term=comperlan+100+technical+data+sheet', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jottigo.ru/123?utm_term=comperlan+100+technical+data+sheet PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/taguxif/bolens_13am762f765_carburetor.pdfIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_c110fec27c9847dc89f287ea13fa8390.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_5252d0badcc0492997e57ac634ee923e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/63802659993.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/purevpn_pptp_android.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_5e228f8c6c8541059f84210524e45a9b.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_eadbf60c13494642b91dc264584b73ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/90157542337.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_f760170849e446f78698d8106cea5e27.pdf?index=trueIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_ec8453cab2f8489fa0b7bb003c242604.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/aspirin_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/galuke.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/anesthsie_tronculaire_dentaire.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_7301b48485404b47804a1bdfc827e052.pdf?index=trueIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_e571c871870144f3b44e765fd7003716.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_3a638efafb8d4db499c2477bd80553a3.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_ada4358796fb496bb193c91289eab032.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdaaec69-4e51-4a21-b510-6df6827c7acb/resumen_ejecutivo_para_trabajo_de_investigacion.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/19407961040.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/92868265431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8beda5e1-4f42-4997-8b75-21bc22c35e70/how_rare_are_piebald_dachshunds.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_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 5412 bytes
SHA-256: d608a2e1b52b73e91a70da91223b3c2b4cef40ecc5ebc3be2d4ccfbba8ae4930
font_01_sfnt_off00013d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D02 11884 bytes
SHA-256: 1097759a9e4e3f2d4afe8a829f314d1e9236cc4bfdd387034997344325c47bf2

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