Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efaa0c396ddf4f4…

MALICIOUS

PDF

62.3 KB Created: 2021-01-12 18:39:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 371fdefccbc8718750951356579aa24d SHA-1: 1c342899f07adb60e30a24e496e1964dd0dd0e9e SHA-256: 7efaa0c396ddf4f45003e8ffbc16a1552304b6642be48eaeada882316439aacb
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The heuristic firings indicate a link farm and a critical detection by ClamAV as a phishing trojan. The ML classifier also strongly flagged the PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/123?utm_term=participles+worksheet+in+english In PDF document text
    • https://cdn-cms.f-static.net/uploads/4489402/normal_5fc16da88795e.pdfIn PDF document text
    • https://miniroworopan.weebly.com/uploads/1/3/4/4/134444940/mekoruzesuluk.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/Mehdogc/xosekiwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f9aedf0d4bac.pdfIn PDF document text
    • https://cdn.sqhk.co/segenoliz/jdhghf4/blackpink_songs_english_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f8f033cc4543.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5fcacb58ea358.pdfIn PDF document text
    • https://daxexamuve.weebly.com/uploads/1/3/4/4/134446800/3075284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5f90744ceb671.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/jolozidabi/65584878172.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/43515903568.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/meta_runner_season_2_episode_1.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_off0000b90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90E 5352 bytes
SHA-256: 180970712bdb20239283beda2092bbea875f6b567c632c5fc6883f691b0b83a9
font_01_sfnt_off0000cb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB53 9760 bytes
SHA-256: 3fe87efeeaa65d25f87e48df58c3b686839c069448978be87c762a9a4cee5a6d

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