Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e16484de9c21bb…

MALICIOUS

PDF

90.4 KB Created: 2021-02-18 08:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d16ddf448b3fd08e0e0a219abfd936e0 SHA-1: 0f0af562fc47cfe5d3a892a580c559480c55b7e8 SHA-256: 91e16484de9c21bbaf8d360b221f1189dbe202d7a77dfecd9c6152c0599df0b6
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting or known redirector infrastructure, indicating a link farm designed to distribute traffic. The presence of a malicious redirector URL and the ML classifier's high confidence score suggest a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=all+souls+trilogy+book+2+summary In PDF document text
    • https://kuwuvolabakeg.weebly.com/uploads/1/3/1/4/131407812/0fa8d53c6.pdfIn PDF document text
    • https://cdn.sqhk.co/pevukoza/kieKPgj/unmatched_air_traffic_control_download.pdfIn PDF document text
    • https://sokowerifali.weebly.com/uploads/1/3/6/0/136053586/voduses-baxopavuz-jebiwewajub.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/rYW8ja5/19737620848.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/7071283.pdfIn PDF document text
    • https://cdn.sqhk.co/vurikede/hdjajho/red_warty_pumpkin_seeds.pdfIn PDF document text
    • https://jeximikukadolo.weebly.com/uploads/1/3/1/6/131636734/f131eafa2c26.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/jfgfjiL/at_t_mobile_forms_login.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/LhfstII/4_pic_1_word_4_letters_leaf.pdfIn PDF document text
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/wokukirur.pdfIn PDF document text
    • https://bidemujoniju.weebly.com/uploads/1/3/1/8/131856381/d81c9.pdfIn PDF document text
    • http://lemovifi.iblogger.org/73333312120.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fosudav.epizy.com/i_love_you_goodbye_celine_dion.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/achievement_cv_format.pdfIn PDF document text
    • http://bepinodobax.rf.gd/barsaat_video_status.pdfIn PDF document text
    • http://repikigerudu.rf.gd/what_is_self_efficacy_means.pdfIn PDF document text
    • http://pejonoma.epizy.com/bottle_flip_3d_mod_apk_unlimited_diamond.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/beaufort_high_school_uniform_policy.pdfIn PDF document text
    • http://lonivone.rf.gd/how_much_are_beginner_guitar_lessons.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_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 5432 bytes
SHA-256: 0c68bb643795372fdf1451ea464edd06851cb8f53c7c685f9f64bc82d0790282
font_01_sfnt_off00013843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 10544 bytes
SHA-256: 173b5bb821a8276ec7c26fdd8b1498658542feae8092f5b9c259638cd0eca0e6

Open this report in the interactive analyzer, or submit your own file for analysis.