Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4c2c676165f7b3…

MALICIOUS

PDF

83.0 KB Created: 2021-03-15 23:08:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48ad38c923e0d31a9ee0555212b64744 SHA-1: 2aa0a02428177102677ea70bdb489ed91e4b4b07 SHA-256: af4c2c676165f7b3ebcd7a9fb9727273f920a1c0e499d415a3a773de5985ac98
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to direct users to malicious or spam content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/strik?utm_term=uk+hip+hop+itunes+chart
    • https://sakojokotinij.weebly.com/uploads/1/3/1/3/131379540/6317288.pdf
    • https://vaxujorukub.weebly.com/uploads/1/3/1/0/131070318/xomevakatu.pdf
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/c6412c.pdf
    • https://lepudumewo.weebly.com/uploads/1/3/5/9/135962044/7cd2ea41366.pdf
    • https://cdn-cms.f-static.net/uploads/4369160/normal_602a04266a137.pdf
    • https://cdn-cms.f-static.net/uploads/4410703/normal_601b27cb252d3.pdf
    • https://cdn-cms.f-static.net/uploads/4492245/normal_6011de463937e.pdf
    • https://static.s123-cdn-static.com/uploads/4373768/normal_6004f6fa9e5fc.pdf
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/tifesujo_robevekeribep_kutunaweboxuf.pdf
    • http://xivusolokedujes.22web.org/nidisujunexukakezuripe.pdf
    • https://static.s123-cdn-static.com/uploads/4366398/normal_5ff9da4a265dc.pdf
    • http://wefabawatewe.22web.org/thorie_des_avantages_comparatifs.pdf
    • https://cdn-cms.f-static.net/uploads/4415534/normal_603f7c866f9ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/safago/somuk.pdf
    • http://pilomewolax.epizy.com/how_to_use_time_management_in_the_workplace.pdf
    • https://s3.amazonaws.com/polojuliragam/mararetilidadotutasixet.pdf
    • https://s3.amazonaws.com/wudibirewuduto/zojexuxisijawu.pdf
    • https://s3.amazonaws.com/patotale/bluetooth_windows_8_free_full_version.pdf
    • http://kivutivepew.rf.gd/happy_birthday_gif.pdf
    • https://s3.amazonaws.com/vufupu/lataganijipiwozixeleveva.pdf
    • https://s3.amazonaws.com/liwara/shylock_character_analysis.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/what_is_a_medical_compliance_specialist.pdf
    • https://s3.amazonaws.com/polojuliragam/monarch_butterfly_printable_worksheets.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_off0001072e.bin
0b73c04e25f527524838c76f442385a22af497b4a13936835e1b22c01e06e10d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 5044 bytes
font_01_sfnt_off00011854.bin
ea429ebfd7e0fb4f32f8a54e6de848c739b0f758e2b9e2590b62164139d43c2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11854 11348 bytes

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