Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c918a4907485e4…

MALICIOUS

PDF

74.4 KB Created: 2020-11-24 23:01:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 313acd3aaa43bc05405a0e86446ae9c3 SHA-1: 2f1d814292834ab87d2f297dd95bd1c12a6d1553 SHA-256: d1c918a4907485e4808ab728c3379358dbdd07e0f22108be8e12dc1c25b426af
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple critical heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure at `https://gettraff.ru/strik?utm_term=force+table+vector+addition+lab+report`. The document body, though heavily obfuscated, suggests a lure related to a 'lab report', likely intended to trick users into clicking malicious links for phishing or malware delivery.

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
  • 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://gettraff.ru/strik?utm_term=force+table+vector+addition+lab+report In PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/04498392f0ce.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/dowavelaxam/41362223634.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/98420548451.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/budget_2019_highlights.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/csec_chemistry_past_papers_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/the_black_swordsman_arc.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/12_million_black_voices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf7a864-f106-4119-a753-d4b42e17d721/gotavewuziladunoxizafimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2c4691b-dc64-4ec1-9a15-c61a2c72061b/83025248586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de6cafd4-ab1d-4733-bb44-da0fd171cd12/90077421217.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/zuxotim.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/gunar.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/maboxedukitenof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea897fb-0d2b-4199-8a70-184bc2e8d281/xuwujuluvubemoxuretutip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18792bec-ea81-40e4-8e5a-7d5f5ea65e9a/lsac_gpa_calculator_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/jspdf_autotable_header_font.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 5044 bytes
SHA-256: 7eb17b89cbb8db7d7186fdf1ed494fd2000a37496bff77dde7c99a138e9901fa
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 10732 bytes
SHA-256: 4f1a2e4227188964b8c7b3bb9e5af0e4c7cf9d26dedbf1a4f7ac13d9b3beebba

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