Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf270cd88aecac68…

MALICIOUS

PDF

76.8 KB Created: 2021-03-15 04:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 078830f5395ce7974b35a25f9e5fbc4c SHA-1: b8e9fb9f5f2b52e86084375b3d731922e69f8e13 SHA-256: bf270cd88aecac68b31363aeab3ee507b16e1be84a073a2a377a1641abc16faa
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. An external URI pointing to 'seumenha.ru' was extracted, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'list of adjectives in english grammar pdf', indicating a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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/award?keyword=list+of+adjectives+in+english+grammar+pdf
    • https://cdn.sqhk.co/digusamixi/ijij0gc/juicy_fruit_strain_info.pdf
    • https://modotetizifoxi.weebly.com/uploads/1/3/1/6/131637555/zidobu-nukozimixadi-kokojifev.pdf
    • https://cdn.sqhk.co/kewebogi/8jficVV/spiritual_gangster_sale_uk.pdf
    • https://cdn.sqhk.co/rifusofuwedi/3D2Aah3/tiktok_starbucks_drink_sweet_cream_cold_foam.pdf
    • http://kevareso.iblogger.org/vufigosamilo.pdf
    • https://rofupujo.weebly.com/uploads/1/3/4/3/134335987/9390325.pdf
    • https://cdn.sqhk.co/sawibevas/JHsAyha/73481386862.pdf
    • https://jugefisofewutep.weebly.com/uploads/1/3/4/3/134368120/842501.pdf
    • https://cdn.sqhk.co/dagozuwemep/gfgitid/matijorifinun.pdf
    • https://vadopesi.weebly.com/uploads/1/3/0/7/130738994/zidivufabipedaguve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xazarujokemus/tenipepenaxexoj.pdf
    • https://uploads.strikinglycdn.com/files/c384a47b-7434-4e1a-8156-efe48a980794/56815180709.pdf
    • http://rusuxagek.rf.gd/25359732288.pdf
    • http://tamufigavoxi.rf.gd/17142061471.pdf
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_56121721c796462a9d81025ef58a77f3.pdf?index=true
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_0009146c359c48aaa2d8ed86de66f9f8.pdf?index=true
    • https://s3.amazonaws.com/patilawasu/gotofulurumamutaxomu.pdf
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_fa585111309742529e710fa8ca17598e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/df7108a6-63d8-4806-ac52-0f219662eee2/best_knot_to_tie_for_braided_fishing_line.pdf
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_c7077c87631e4d99854979fbf016a877.pdf?index=true
    • https://s3.amazonaws.com/salade/92395939311.pdf
    • https://s3.amazonaws.com/gumegulaxi/azonix_font_free.pdf
    • http://kefofasenufumug.epizy.com/nabewo.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_off0000ef27.bin
01692baad5388cc5ce99d0f553ea64bc69c1c4b59b5b88bbdaf76a0fcae57664		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 5644 bytes
font_01_sfnt_off00010243.bin
eb665892d13931ed4cd7c69aee6d712f61af7eb8a6311c76c5c2817990779b17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10243 10612 bytes

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