Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25790ff00778af7…

MALICIOUS

PDF

79.1 KB Created: 2021-04-04 14:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec4183199c556f4b05a2a620d92b3d90 SHA-1: 52c4523f44d1fe0186dd585aadf37c4a923a2500 SHA-256: e25790ff00778af72922d90fc3cc42a88e9a8bf51bb215d6868eea1a55135675
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/wix?keyword=unit+8+right+triangles+and+trigonometry+homework+2
    • http://kolagozisil.mywebcommunity.org/assimilation_rules_in_english.pdf
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/tijevanimone.pdf
    • https://popofexepazor.weebly.com/uploads/1/3/2/6/132680818/be297e6246247.pdf
    • https://wupixizot.weebly.com/uploads/1/3/5/3/135398135/dcdf3f5ec.pdf
    • https://gibitomenufe.weebly.com/uploads/1/3/4/0/134041720/5410866.pdf
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5fe4a0658bb34.pdf
    • http://gekodejevotug.medianewsonline.com/sivesaxamokudo.pdf
    • http://wupevijijoze.mygamesonline.org/45754624933.pdf
    • https://cdn-cms.f-static.net/uploads/4373511/normal_60445c9e594da.pdf
    • http://gufurebu.medianewsonline.com/does_the_constitution_explain_the_electoral_college_system.pdf
    • http://vufiwopader.medianewsonline.com/wanting_memories_sheet_music.pdf
    • http://tezibif.mygamesonline.org/structure_and_properties_of_copper_and_its_alloys.pdf
    • http://jovopomutulilo.medianewsonline.com/55032938774.pdf
    • http://jokojujut.medianewsonline.com/26188193950.pdf
    • https://bajumavo.weebly.com/uploads/1/3/4/4/134486103/bakiwimej-xodirus-zirudise.pdf
    • https://zirejuvisipaz.weebly.com/uploads/1/3/1/6/131636922/wizuxigi.pdf
    • https://gukamixi.weebly.com/uploads/1/3/4/0/134042495/9ecd8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://witesenigo.atwebpages.com/94509837601.pdf
    • http://texazufuvo.rf.gd/brom_lost_gods.pdf
    • http://viwuleraxukopiz.epizy.com/tefixavamapaxuzowelo.pdf
    • http://baxogezupeg.rf.gd/l2_classic_adena_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f268.bin
3fe6ee34224c4d5c45689c912e8248321849de63e373dcbe90034b058418214e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 5812 bytes
font_01_sfnt_off0001061b.bin
a0e3ae704a6a9efe1e09e9244011bf3f21e25e7d3797b9255cd8c51cc7f2c8aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 11352 bytes

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