Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b16c13597c9e02b…

MALICIOUS

PDF

77.9 KB Created: 2021-05-03 06:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ca105b39f9fc4cc12c2f5a9852265a5c SHA-1: 3ebc888f546a8a9d2776da1d94fb2d8d4152ae96 SHA-256: 5b16c13597c9e02b8c2aebf674a066dab69899ee227f3e2a0519a68c417fdf86
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'crophysi.ru' as malicious. The document's content, though heavily obfuscated, appears to be a lure, possibly related to educational materials, to entice clicks on these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crophysi.ru/strik?utm_term=5th+grade+reading+textbook+pdf In PDF document text
    • http://uspeh.icu/66486216822jp10w.pdfIn PDF document text
    • https://jimutovila.weebly.com/uploads/1/3/1/8/131856698/pikolimere-pigasulinujem.pdfIn PDF document text
    • https://zegokovoni.weebly.com/uploads/1/3/4/3/134323662/xopimepa.pdfIn PDF document text
    • http://vixabaj.scienceontheweb.net/coordinate_geometry_distance_formula_worksheet.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/lexofoduposivadetek.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/74838751310.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/vopamab.pdfIn PDF document text
    • https://kazanuwe.weebly.com/uploads/1/3/2/6/132683097/8205204.pdfIn PDF document text
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/a218bb91cea5f23.pdfIn PDF document text
    • http://navalny.design/pathfinder_advanced_race_guide_trovenzx28.pdfIn PDF document text
    • http://konolux.medianewsonline.com/96939487949.pdfIn PDF document text
    • https://zovezeko.weebly.com/uploads/1/3/4/6/134697242/jemorazu-labuf.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/disumufaq4d92.pdfIn PDF document text
    • http://prostotit.site/110146344752y9h9.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/lawuvilexi.pdfIn PDF document text
    • http://ozalupa.space/what_is_conversational_voice_in_english_grammarvldti.pdfIn PDF document text
    • http://dekoriribazovax.mywebcommunity.org/pupibusanu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_30b6a5c4b27a4085bf8acc44dc1aaaac.pdf?index=trueIn PDF document text
    • http://suvalomimo.atwebpages.com/84452057425.pdfIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_425c2c1fa9064ad8bd9081c2dac1a5ce.pdf?index=trueIn PDF document text
    • http://kevanuxedogiko.rf.gd/19493321272.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_c790a28225b445269b891bdf10af8fdb.pdf?index=trueIn PDF document text
    • http://mogorixonub.rf.gd/teminegap.pdfIn PDF document text
    • http://vomozenofeke.epizy.com/wusurokesozipizulasodejud.pdfIn PDF document text
    • http://xakafof.rf.gd/reformation_study_bible_esv_premium_leather.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_0415786882ec4c4ab8ceaa3be8a58de8.pdf?index=trueIn PDF document text
    • https://16b16ea1-1eac-4681-bfdb-39d0b7b0c60a.filesusr.com/ugd/d6b497_cf20e7f650b24cc79ceda3eeed82ef1a.pdf?index=trueIn 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_off0000f08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08E 5396 bytes
SHA-256: f3bf6f924942b5fbe551bfb22c29bf23cbafd30083a7cf6ef2f1c7e900011613
font_01_sfnt_off000102e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 11680 bytes
SHA-256: 2ae7c731e5bb2a132eeb4091ad606f5e56298745d6758b429f70758269d566ad

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