Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef7c843c0d53521…

MALICIOUS

PDF

67.3 KB Created: 2021-02-20 11:49:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4c680f709c795e068a7a27acc89e01c1 SHA-1: 4451a9420bd9d13dc1ca5d29ef7f01c5cbf35508 SHA-256: aef7c843c0d5352138b0bd25c98348f902a9d4dc634eb7bae31168b84d65f54d
222 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various platforms, suggesting a link farm for SEO manipulation or malware distribution. One critical heuristic identified a link to known malicious redirector infrastructure, further indicating malicious intent. The presence of a 'download button' heuristic reinforces the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/wb?keyword=asm%20fm%20manual%20free%20download In PDF document text
    • https://fijuxibafituwu.weebly.com/uploads/1/3/4/1/134109117/jopatuvalujaw_jevesan_borivadexanem_jozef.pdfIn PDF document text
    • https://fixaporaxaju.weebly.com/uploads/1/3/1/4/131413905/semutopona_lexarudatu.pdfIn PDF document text
    • http://kuxuvajivor.iblogger.org/kathi_mela_kathi_video_song_720p.pdfIn PDF document text
    • https://pefiritiz.weebly.com/uploads/1/3/1/4/131453982/6310903.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/gajobupodirokatusiw.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/wezukep/in_the_mood_for_love_poster_buy.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/xufuzixatidijajoza.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/82496100942.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/harbor_breeze_remote_control_sync.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/pozunudebipagodivisoboji.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/21483012859.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/google_sheets_bar_graph_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/rovagitinikan.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_off0000c863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC863 5136 bytes
SHA-256: 56bce7909d7b60446e563770e1e605368c56d115b47250b354ab7d3f1426edfa
font_01_sfnt_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 11448 bytes
SHA-256: 21e4ac63594f33a58df9dffb1434505cc26d1981e91c983ea9edde77e8fd3fb3

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