Malicious PDF — malware analysis report

Static analysis result for SHA-256 0572f0f4d25eae44…

MALICIOUS

PDF

80.6 KB Created: 2021-01-13 17:33:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e7f9799079bcc54341abaacd11160f86 SHA-1: 5f594bcedc8a8ac172b5a86866c3b40a355fcd23 SHA-256: 0572f0f4d25eae44a2f444afabefe50fd2a4c8957f6f55cf231f7578ace92466
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 as a PDF link farm, with one prominent URL pointing to 'trafffi.ru'. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a song title, likely intended to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffi.ru/aws?utm_term=lagu+oh+my+way+versi+dangdut PDF link annotation
    • https://site-1173983.mozfiles.com/files/1173983/hackers_soundtrack_vinyl_discogs.pdfIn PDF document text
    • https://site-1168031.mozfiles.com/files/1168031/xowunugalerepimoz.pdfIn PDF document text
    • https://site-1177284.mozfiles.com/files/1177284/mexoduzutopubetazaja.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/dhg0Wih/weather_jacksonville_florida_forecast_radar_severe_alerts.pdfIn PDF document text
    • https://site-1176426.mozfiles.com/files/1176426/xawowefumagim.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/88fde7e305cd4.pdfIn PDF document text
    • https://site-1168034.mozfiles.com/files/1168034/georgia_natural_gas_comparison.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/rojovufeperer_dabemikor_repujexafiji_pezaduwizonusi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wujodibu/zojaxarisuzitan.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/anselmo_ralph_o_cupido.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/irregular_verbs_worksheets_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/taronovatogegejubi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ff78.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFF78 23220 bytes
SHA-256: 8dd6d473f0aa432801ea5ded94ccfd2444fea585498cb5683aa04b6910c2b790
font_00_sfnt_off0000cb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3F 5284 bytes
SHA-256: bcefbb5cdfb844a9e498e0bb69c38b8dfcb1c1fa5acbffafc48d6c9826d72e60
font_01_sfnt_off0000dd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD30 10084 bytes
SHA-256: 3b7d7d10ac3f183df4f8246b20ae15b3ebeb9430148fff14e78f7251f2b8eb1b
font_03_sfnt_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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