Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de8df423182f12c…

MALICIOUS

PDF

76.7 KB Created: 2021-02-21 13:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 01817fb07a740c5485545e5962b9b1c5 SHA-1: f710489d97b77e0201b48367760f88a265ff895b SHA-256: 1de8df423182f12c22eae8617006784efe9f209db21f68741f8fcc4a577ff2a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly unrelated PDF documents, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is 'https://maypoin.ru/strik?utm_term=how+to+teach+time+management+skills', which is likely used for phishing or to host a secondary payload. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=how+to+teach+time+management+skills PDF link annotation
    • https://vimixake.weebly.com/uploads/1/3/1/1/131164471/nizivunemit.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/6jfieDJ/tozapegatisasivaj.pdfIn PDF document text
    • https://jowatewiko.weebly.com/uploads/1/3/1/3/131380225/9303812fc6.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/AWgjigV/the_cook_3d_cooking_game.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/6a29b61.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/ihhiibe/xofas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478146/normal_5fceadebeb8dc.pdfIn PDF document text
    • https://xunilizavokuniz.weebly.com/uploads/1/3/6/0/136050149/nabedataruvivi.pdfIn PDF document text
    • https://cdn.sqhk.co/lotivadafe/eMjiIne/kelobojirofazu.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/wanaw_jugez_tebar.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/f6Xigib/survival_rate_of_aml_leukemia_in_adults.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/lolijexejomak/differential_calculus_topics.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/vagunamadap.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/calendrier_juillet_2019__imprimer.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/27104451975.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/59669590695.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_off0000f1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AE 5232 bytes
SHA-256: 21d8b346e664ebc3f490c4204521a0945ff7b4214c7ecfc6da7894ef5e77e363
font_01_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 10224 bytes
SHA-256: 0778ec7b0a1e1d6a30373b7b5aa87d9e98c222aa2157554587fd0eb83c1dc2aa

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