Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77cb1557728d9af…

MALICIOUS

PDF

74.3 KB Created: 2020-12-17 04:16:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 23e9b1ab514c8f9bef15e79f72e50185 SHA-1: d6acfbc62c91880f75664ec2ec67d86e2055a32c SHA-256: c77cb1557728d9af0bbb87bd2d8d9cdd41122fc29af65dd4f6e913123fc375a5
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 as malicious by ML classifiers and ClamAV, indicating a phishing or malicious intent. It contains a large number of external links, with one suspicious URL pointing to trafftec.ru, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=tan+physics+reviews PDF link annotation
    • https://dejoputaxili.weebly.com/uploads/1/3/4/7/134763817/1241738.pdfIn PDF document text
    • https://mekapejodefab.weebly.com/uploads/1/3/4/7/134740006/sejake.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/tutapaxi/93072005405.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdee3c61e25426e1fdbfef/1606282815327/madden_mobile_database.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1939ac6d964583626ee44/t/5fcf751f05f6f278075b12d0/1607431456263/podivuvirirexo.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/bipetoserogawin.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcf214afa8be4403e0b1313/t/5fd65aaa89566e781f4e23be/1607883434830/34624982062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12b52e27-9992-4716-9d6a-3b764c90fd89/funny_puffy_paint_shirts.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/aircraft_weight_and_balance_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5827fa879396864275a1a/t/5fd066283364176a125ba2c8/1607493161205/6782443478.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/sesumixumi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2d93d1c8c7413143ea957/t/5fcc803c24c49707d318cb20/1607237692678/dirumotozizun.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c959405d5340f34b395e/t/5fc6d5dba3696915e2128c52/1606866396118/vuzaverapodizisopi.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/10598477827.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/20604279654.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/letterhead_design_templates_vector_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe015c3f75b166439ba11c/1606287711310/stealing_frost_horse_skyrim.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 5192 bytes
SHA-256: 92cd5e622986213e474326f8ce40c953427cc5b936ce0651831d9dc146a5fe5d
font_01_sfnt_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 10124 bytes
SHA-256: 935a28544fabd373736a019b57ecafe03ee7f85ae9680349744c73e08617f027
font_02_sfnt_off0001074c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 16108 bytes
SHA-256: e78e2386c3cd7a2e56b7bf26531ef40ff7c6a27f1fe4e31e2c710210226330a4

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