Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f0d41253330328…

MALICIOUS

PDF

76.7 KB Created: 2021-02-20 00:06:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 66d0a69cc1b87068920adddb7bf4276f SHA-1: 4b1a2917176fac1d46dc956a344302893ec54982 SHA-256: 61f0d41253330328fb99f4a0516868dbc4591a76e41eb29b1cb7b7afd3c2f945
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL, 'https://jacksth.ru/123?utm_term=are+mini+splits+more+efficient+than+gas', suggests a deceptive lure related to energy efficiency. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further indicates malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=are+mini+splits+more+efficient+than+gas PDF link annotation
    • https://xateboduf.weebly.com/uploads/1/3/1/4/131483383/c79b0fb935cdb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483335/normal_5ffbb826b35a9.pdfIn PDF document text
    • http://omoikiri.info/kali_linux_for_windows_10_iso6xc83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388293/normal_5fe0b7e27e55e.pdfIn PDF document text
    • https://wovorixikamaso.weebly.com/uploads/1/3/1/3/131378932/fobajurep_lekudusorot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tokit/why_is_civic_important.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/romasefamowevemajana.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/ciracle_goodbye_blackhead_off_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/angry_birds_java_game_128x160.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/36272008100.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/15685622595.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/gajazanisoroderipewata.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/lojuzivori.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/masked_singer_australia_prawn_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/arthdal_chronicles_episode_1_eng_sub.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_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 5208 bytes
SHA-256: ba1d85673933c9535debaa8ec10f7bee8655844f6f6fc0b7c5b934959b6b41a2
font_01_sfnt_off0000f187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF187 11156 bytes
SHA-256: d0170a716517475e4df94b519e24f987206f78c06f0db57032f47e33106194f4
font_02_sfnt_off000117b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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