Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bcc67e5792d290…

MALICIOUS

PDF

67.8 KB Created: 2020-12-21 12:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 83d2e7c293d6fb64c77e909c44d27f8f SHA-1: 97a88f2d090ee35dc0e179c934ec335761c507fe SHA-256: b8bcc67e5792d29083f8e0d2115ca7d6a7743a354971c6bd533e8e5432e2a309
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, with one prominent URL pointing to 'trafffe.ru', suggesting a link farm or redirection mechanism. The presence of numerous PDF links, including one to an Amazon S3 bucket, indicates an attempt to create a deceptive SEO-driven content farm, likely to host or distribute malicious payloads.

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://trafffe.ru/strik?utm_term=monster+truck+cake+pops PDF link annotation
    • https://todurudivi.weebly.com/uploads/1/3/4/3/134344361/fukurigi.pdfIn PDF document text
    • http://sheridancoffee.shop/uploads/1/2/9/5/129527196/129527196.html?strongholdIn 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/fasanag/mietbrgschaft_eltern_vorlage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c41330-0df8-4555-9516-333bbef034fe/cuanto_milimetros_tiene_una_pulgada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b17285c-df75-46aa-b45c-35960698d40a/91386115115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3a1edd-8b4e-4c69-bbbb-390cac7ba30e/http_sheridancoffee.shop_uploads_1_2_9_5_129527196_129527196.htmlstronghold_2_review.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce89a9d05a953d859f306b/t/5fd61c5289566e781f46f435/1607867478399/days_of_the_week_worksheets_for_coloring.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/couch_to_5k_running_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/16278282180.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0d44f8cdb769c6aa8c75/1606290756808/xeteje.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/escape_room_game_answers_level_44.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B4 4800 bytes
SHA-256: 07272e247ff75700afe0ceade169224b04271811805d233cdc24c178abcb231e
font_01_sfnt_off0000d116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD116 10500 bytes
SHA-256: 00a4bdf5c9edb4b722333e036573cde5cc6ecd2362faac4548ac1378bc4cb365
font_02_sfnt_off0000f4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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