Malicious PDF — malware analysis report

Static analysis result for SHA-256 df37eebf63549171…

MALICIOUS

PDF

71.2 KB Created: 2021-03-24 12:01:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d06176deed5b0dd1b3f8dfbcd901df67 SHA-1: aa954712de7bbcb987d6a7f4f7754e7f6d0f4db3 SHA-256: df37eebf6354917187ac94954810ea09c861a592771f8f4783ce56271194831e
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=statistics+freedman+4th+edition+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which is 'https://s3.amazonaws.com/zaxefemebidaz/78444448690.pdf'. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojan-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=statistics+freedman+4th+edition+pdf In PDF document text
    • https://lugifepitel.weebly.com/uploads/1/3/2/7/132710690/1a79c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_602574f73edd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_6027f00588561.pdfIn PDF document text
    • https://tarivoda.weebly.com/uploads/1/3/4/6/134693378/xuwifiz_rowibojesip.pdfIn PDF document text
    • https://nojokuvevufig.weebly.com/uploads/1/3/4/1/134109253/7057228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456166/normal_5fe3b2992214d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_600e25cb1548a.pdfIn PDF document text
    • https://luzibajaxu.weebly.com/uploads/1/3/2/6/132695572/tefulaxozisodufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_60567fcf72dc8.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/zaxefemebidaz/78444448690.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/bwana_yesu_asifiwe_partition.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/everyones_an_author_with_readings_third_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/46512569458.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/76427565070.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/is_the_alienist_returning_in_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1a67b7-c4ed-47da-ad78-2c15c6ba0da5/the_argonauts_maggie_nelson_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b093c0-0a0c-43bc-b3bc-52260486bd79/how_to_cook_dried_chickpeas_ultimate_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/lagu_blackpink_whistle_planetlagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8378f0e9-4e27-4517-ad9d-15fada909230/tavukowixixubapod.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/nice_meme_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebbd357-2184-46d0-80eb-98d9597419fb/69481999005.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/jaxisexefiwilus.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/wamesotezupuxor.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_off0000d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 5556 bytes
SHA-256: b1290446900abfccdde1d69b76b59cd76550f38ca424661f6687e1f6d05cd8e2
font_01_sfnt_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 10972 bytes
SHA-256: 688662089a3546d82b76769d7762f78f754294fb4ffa16470da55d868183a137

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