Malicious PDF — malware analysis report

Static analysis result for SHA-256 73debd5057946633…

MALICIOUS

PDF

86.1 KB Created: 2021-05-17 03:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f13a6d3b4bad6440b98b39ac14fcb27 SHA-1: 2bfe12a2af3e61751d5dac7e83757dadcdb28b18 SHA-256: 73debd5057946633ae847b92fc94ec441df7648ccfcecd2b65d41dc95ad7cfec
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one prominent URL being https://seumenha.ru/strik?utm_term=whirlpool+quiet+partner+ii+size. This suggests a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan distribution vector.

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://seumenha.ru/strik?utm_term=whirlpool+quiet+partner+ii+size
    • https://static.s123-cdn-static.com/uploads/4413243/normal_6008e9f84e741.pdf
    • https://cdn-cms.f-static.net/uploads/4483855/normal_604f54e5127dd.pdf
    • https://static.s123-cdn-static.com/uploads/4374372/normal_600836b488ab1.pdf
    • https://static.s123-cdn-static.com/uploads/4393776/normal_60025abb33862.pdf
    • https://cdn.sqhk.co/zotenejek/djcjghb/.pdf
    • https://jisasulozif.weebly.com/uploads/1/3/4/3/134371627/5f9d9.pdf
    • https://cdn-cms.f-static.net/uploads/4379377/normal_605cabdb87485.pdf
    • https://cdn.sqhk.co/wazilisiko/hNOjaif/bafopix.pdf
    • https://cdn.sqhk.co/kitujesijak/VhgielM/99847149142.pdf
    • https://lajogaful.weebly.com/uploads/1/3/4/4/134481829/sonobilomazo_tusoruruvik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f18bdc87-5845-427e-9168-8d241a909158/superman_and_me_exploring_the_text_questions.pdf
    • https://uploads.strikinglycdn.com/files/ec82028c-6eb1-42bc-a0e2-b4a9e728cfe9/70264948436.pdf
    • https://s3.amazonaws.com/gajabedafot/how_long_do_you_cook_venison_jerky_in_a_dehydrator.pdf
    • https://s3.amazonaws.com/forupokisip/why_my_samsung_ac_is_not_cooling.pdf
    • https://s3.amazonaws.com/tunenijexe/fusiform_aneurysm_meaning.pdf
    • https://s3.amazonaws.com/xowasosuf/23513969905.pdf
    • https://s3.amazonaws.com/fobupojowojon/mivofabiwixiwaf.pdf
    • https://s3.amazonaws.com/dorobukasawituw/karen_brown_reporter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fed9.bin
1c34746bb71c6580bf0a25f15730c61e98f1e0a464f6ad254c1ffd7e559c0d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 4976 bytes
font_01_sfnt_off00010fc7.bin
df427c87f26243b4dfd2cf57c598233684fafda30315d1422ba9ce8071c6e761		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 13500 bytes
font_02_sfnt_off00013b8c.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8C 4324 bytes

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