Malicious PDF — malware analysis report

Static analysis result for SHA-256 de46f3dff05f67c7…

MALICIOUS

PDF

63.0 KB Created: 2021-02-21 21:33:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 66a76c71ba5d4dd065a8e3bcbc59c0e6 SHA-1: e6c2b638f7f181dae7041d704e675fa471ac2288 SHA-256: de46f3dff05f67c7038fa68362fd7b784e107f00eb9485a863639487d7b09a5e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, appears to reference a 'nkjv leather bible for sale', likely a lure to direct users to malicious sites. The presence of a link farm and a redirector strongly suggests a phishing or scam attempt.

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
  • 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=nkjv+leather+bible+for+sale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481985/normal_5fd157dd58456.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/fjck0hg/juvoturezalinupajepobovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488322/normal_600c94237144f.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/SIggjiU/jexavizobaxuku.pdfIn PDF document text
    • https://mumizajasaliso.weebly.com/uploads/1/3/4/5/134598274/4733287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_60183deebe555.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/rR1wtig/novalirapilemoxegil.pdfIn PDF document text
    • https://cdn.sqhk.co/pawijilabu/T4jgnMS/magic_spell_words_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/gjdjbzB/vivi_bubble_tea_popcorn_chicken_calories.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/dhjLCSq/fawiwupofosezixiwuz.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/DfjdifZ/general_hospital_spoilers_september_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/hQpgjii/sync_gs_race_suit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bazuliditufo.epizy.com/java_jdk_8_ubuntu_18.pdfIn PDF document text
    • http://xunixamobogu.epizy.com/13034967977.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/zujakumekakoxisi.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/zipigigetapenusi.pdfIn PDF document text
    • http://palakojum.rf.gd/android_version_8.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_off0000b9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E9 5164 bytes
SHA-256: d9a0bb1e0f255a73246a827500e7703820bc57e7275c73dd2d43788077c567ea
font_01_sfnt_off0000cb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB84 10496 bytes
SHA-256: d9241ba6b3007b41aabcb186926ccd3cb7165a165d49c9af4c2c77f98afdf6a9

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