Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e4303bcdf826d5…

MALICIOUS

PDF

77.6 KB Created: 2020-11-23 19:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 779e469965377357bccc15f87b3f6673 SHA-1: 197fa9766d05aa556b811d45fba297002ced0e4d SHA-256: 42e4303bcdf826d5021932b936b8879a3a5adc76d5b7339aa453285ff7085357
214 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. It also exhibits PDF_SEO_LINK_FARM behavior by containing numerous external links, disguised as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=x+plane+addons+store In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f871dcf948b8.pdfIn PDF document text
    • https://pirovosarelivo.weebly.com/uploads/1/3/1/4/131406751/520603.pdfIn PDF document text
    • https://dopozigixojak.weebly.com/uploads/1/3/4/5/134509916/kurafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f8982510a067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_5faec2cf9ea55.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/xakusineba/electrons_configuration_worksheet_answers_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a16483-2912-47c2-bb25-99c21ba0a385/75331344294.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/bemawened.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/arduino_tutorialspoint.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/wowebipufiw.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/61089150852.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/hanuman_chalisa_fast_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/5300_product_manual_rosemount.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/bellingham_ma_police_reports.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 4668 bytes
SHA-256: cf974b08c2bca965d8ed417dc433f36a45ae9321c081840ead19549b8d9c439d
font_01_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 11628 bytes
SHA-256: da9f0ec81da53cecb49fc33637d2af0c82963a8bb84b5c9c4a2cf28de73a3ae7
font_02_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 16144 bytes
SHA-256: d2d14ee152591f1391b9c182731dc81228c2f3de4d706c9bd7d93c14ae925181
font_03_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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