Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74d68d948447f80…

MALICIOUS

PDF

85.5 KB Created: 2021-01-10 23:01:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1cce4c58b3b6851f1ba9d4a4f8a58192 SHA-1: e3df9fb95b4b8779d79e04766605c1f2a8699798 SHA-256: b74d68d948447f8053be9db7dddbdcdda91e9908c1b868c7d7ee0e5f9ce7cf7c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one critical heuristic identifying a 'PDF_SEO_LINK_FARM' pattern. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary malicious URL, 'https://trafftec.ru/123?utm_term=clark+y+airfoil+cad', is likely used to host a phishing page or distribute further malware, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/123?utm_term=clark+y+airfoil+cad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452374/normal_5f9ffe3e68a75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451363/normal_5fbd3d31eba50.pdfIn PDF document text
    • https://site-1168207.mozfiles.com/files/1168207/66282042408.pdfIn PDF document text
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/7082224.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/bokelur/common_acid_base_indicators_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/algebra_1_solving_equations_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/brutal_black_dragon_osrs_money_making_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/programa_para_backup_celular_android.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/penguin_readers_level_4.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/dajodopevorusa.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/how_to_add_calendar_in_excel_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/47991010449.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/sogulopejafizidebawofuw.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_005_off00011c93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11C93 24884 bytes
SHA-256: bc842abbeaa869967fa9df1f4928e7f499787052b317ca0de47148b6ffc7c7dc
font_00_sfnt_off0000d5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B0 4032 bytes
SHA-256: 9440f71eefa4f59c7a71b16fb0b9f65724f2db68f71ee41650680a98f027c4b0
font_01_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 4908 bytes
SHA-256: 458d3899e8d5c6c055ee5feea1bc25d316603fab00cc2729ffe6ad3e2361359f
font_02_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 11920 bytes
SHA-256: 2fc4aa8a0b7d41d4b82e7b233e6f90edf0971690be3abc06e61616a80f183182

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