Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d006f29db8e680…

MALICIOUS

PDF

89.8 KB Created: 2021-02-21 03:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4b47d12e7f5ddf48f653f61f564e5f40 SHA-1: dd7ba1b999eb3930c0849010909beac53a1a5935 SHA-256: 76d006f29db8e680dbd6f39f5f28ac9c3a1eee2802483b663572fab0ff70b5cc
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://yafferge.ru/strik'. This indicates an attempt to lure the user to a harmful site. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, including 'https://s3.amazonaws.com/dazemi/46416563329.pdf', suggesting a broader campaign. The ML classifier and ClamAV detection further support its malicious nature.

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
  • 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.
  • 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/strik?utm_term=what+does+godfather+mean+in+the+bible In PDF document text
    • https://gutazalofekeva.weebly.com/uploads/1/3/5/3/135395177/9895778.pdfIn PDF document text
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/1118649.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/1676631.pdfIn PDF document text
    • https://cdn.sqhk.co/wofetewa/aibiaRj/xomuxifevavunewev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fe0f1a6924c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455907/normal_5fd67f5dcfb28.pdfIn PDF document text
    • https://cdn.sqhk.co/fakineduxafe/emge6je/knock_down_the_house_netflix_documentary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376098/normal_5fca439ea30b7.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/dazemi/46416563329.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/56161114588.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/sawoxujubow.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/wugosobokawexam.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/lovely_noor_all_punjabi_song.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/yugioh_card_guide_booster_packs.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/android_animatorset_interpolator.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/chittara_moodo_veleli_video_song.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_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 4148 bytes
SHA-256: b61a5eb1abbe02702aed5625988671e65309d74ed3e6c0926aecdff7d512e712
font_01_sfnt_off000121d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D0 5476 bytes
SHA-256: 9229966cd512a32f4ef55d178d137f73b78c1d575cd6dc4e36295fcd894871e3
font_02_sfnt_off0001344e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 11108 bytes
SHA-256: 6008f5e89c3e5f5b6174546ecdafa708dafd459d7bc0460f8608d73ec70f7abc

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