Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53539ee867edc4f…

MALICIOUS

PDF

83.4 KB Created: 2021-03-17 06:28:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80f22a35c12bd48a0ba23bb4bac8649e SHA-1: 7af1e64d31d270b4775f570e7a59c66751850028 SHA-256: e53539ee867edc4f3fb49b09c7181cc97e99746354f021ace7eb0be0f161f264
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the primary heuristic indicating a 'PDF_SEO_LINK_FARM' and a high ML score for maliciousness. The ClamAV detection further confirms its malicious nature, identifying it as 'Pdf.Phishing.Trojan'. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://pelibifir.ru/strik?utm_term=para+que+sirve+tomar+te+de+manzanilla+con+anis
    • https://cdn.sqhk.co/mewoveri/ielwOgi/learn_thai_massage_online.pdf
    • https://cdn.sqhk.co/dikabopagesi/jgBhhja/mupipiwefifujexede.pdf
    • https://rajizoru.weebly.com/uploads/1/3/1/8/131856770/ff0cef47bf0.pdf
    • https://cdn.sqhk.co/xafogatok/bzejhhe/aviculture_au_sngal.pdf
    • https://cdn.sqhk.co/gijimexuv/hsu8Egf/fonis.pdf
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/namiduxivoxapuwo.pdf
    • https://faxilazow.weebly.com/uploads/1/3/4/7/134725206/xelepiwagelakes.pdf
    • https://jaboxuliko.weebly.com/uploads/1/3/4/6/134693041/5753667.pdf
    • https://dakezevowefop.weebly.com/uploads/1/3/6/0/136088489/2864349.pdf
    • https://milikosepawina.weebly.com/uploads/1/3/2/6/132696406/sewopazofelerabawu.pdf
    • https://ximesadi.weebly.com/uploads/1/3/0/9/130969353/eed96.pdf
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/jodelajubinewew.pdf
    • https://sokexuwog.weebly.com/uploads/1/3/4/3/134351495/fezunumabawilo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0a3bebc7-d98d-401d-b33e-78ddbfe90bc4/largest_us_army_base_germany.pdf
    • https://uploads.strikinglycdn.com/files/93e6634c-8787-4c45-ac9e-edd52c3479b6/fagumimoxuserewosewe.pdf
    • https://s3.amazonaws.com/wutogugej/70857813350.pdf
    • https://uploads.strikinglycdn.com/files/828cca73-0adf-4bd3-b516-186dafcbd2b0/28495819212.pdf
    • https://s3.amazonaws.com/gekixadonuru/avengers_academy_apk.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_off000108ce.bin
06c145294ab5e03a65ec077a04644118b912219e194c30b40823f8f5be184551		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 5324 bytes
font_01_sfnt_off00011adc.bin
b7c793d6fe401a4ef5eda4a3e724d318d2df5c4c255945e9684cbada959ac256		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADC 11044 bytes

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