Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4a10350788969d…

MALICIOUS

PDF

85.1 KB Created: 2021-04-03 21:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0fd968eca674ce71f35cda2d1a84656a SHA-1: 07fa31178f11718405d131ef222dd554493911f2 SHA-256: cc4a10350788969d5e146d6d7b983f2daaf9b97826201a5e56191441aee3f1ed
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to a potentially malicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF structure suggests it's generated by wkhtmltopdf, and the presence of many external links points to a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://mezovuduw.ru/123?utm_term=uses+of+plants+worksheet+grade+2 PDF link annotation
    • https://bupigesow.weebly.com/uploads/1/3/4/3/134360728/lulopo_dutowozulemixib.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/mesufu.pdfIn PDF document text
    • https://niforobufuxir.weebly.com/uploads/1/3/4/5/134512868/109094.pdfIn PDF document text
    • https://tapojofam.weebly.com/uploads/1/3/4/5/134518610/jusumexexibajev-mubisekedep-pubaditefitoreg-lidulufo.pdfIn PDF document text
    • https://kerozutovazo.weebly.com/uploads/1/3/0/8/130813796/bomesexoxef_wozafalib_bazabidin.pdfIn PDF document text
    • https://fisujurij.weebly.com/uploads/1/3/1/4/131437504/dulibik_ropubot_renij.pdfIn PDF document text
    • https://bexoxofimimiwox.weebly.com/uploads/1/3/0/7/130775405/zokifadifepeme-nowisilotirited-soxemuxutu-wubovizumuvafi.pdfIn PDF document text
    • https://vidiguwases.weebly.com/uploads/1/3/4/3/134347373/ae77cadca.pdfIn PDF document text
    • https://najagoji.weebly.com/uploads/1/3/6/0/136082188/wuranizobotek.pdfIn PDF document text
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/fagekoz.pdfIn PDF document text
    • https://tinijaxiri.weebly.com/uploads/1/3/4/4/134440903/1252256.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/zadulosijiwibaz-buvatukegit-garilobomewu.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/feliso/rudif.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_a0114a1081fc4e94965f8b5ebd6d035d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/apache_ant_1._10._1.pdfIn PDF document text
    • http://bupagaruwizuzu.epizy.com/72648258400.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/27327599085.pdfIn PDF document text
    • http://pumejusatojajeg.rf.gd/all_colours_name_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/bacterial_meningitis_management_guidelines.pdfIn PDF document text
    • http://notewewagegev.rf.gd/msds_boraks_bahasa_indonesia.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_9f3d6d72a89941aab4b6aea145472887.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/63282289825.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_off00010ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC8 5584 bytes
SHA-256: e9ddf8341f0a63156e988e87593b7f5c2c024bee97bf35ccc52a483efc4733c3
font_01_sfnt_off000121d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 11048 bytes
SHA-256: 2d276a71c10afbb8db980a2c7c003c7f7eb04b35b4f2c7c51929795d0d041916

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