Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9ca6a6c94cac88…

MALICIOUS

PDF

71.4 KB Created: 2020-12-19 21:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5c90277181f0fa5be1a71dfdb2313cba SHA-1: e3d88b64e8f535205cbd99c39c117cbaca7bb421 SHA-256: be9ca6a6c94cac8844a7a5e3405b578f17501448f64a89b79f6ba640172768da
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links to redirector infrastructure, specifically identified as a link farm for SEO purposes. One critical heuristic indicates a direct link to a known malicious redirector, suggesting a phishing or malware distribution attempt. The presence of numerous PDF links, including one pointing to a potentially malicious redirector, indicates an attempt to lead the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffking.ru/aws?utm_term=chaff+cutter+machine+design+pdf In PDF document text
    • https://savegisat.weebly.com/uploads/1/3/4/6/134609021/8865434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444115/normal_5fb6abc31f1a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459025/normal_5fbf5eb78ce15.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/zabevog/warhammer_40k_codex_space_marines_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/699c114f-8682-4671-a58c-268f1530d125/zowonezavezejivujusimiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9250f8-6159-4faf-a42b-0efdb5b088ab/fundamentals_of_signals_and_systems_using_the_web_and_matlab.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/jomekugunalitax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf169bb-cf37-4835-aede-8b99676b13cc/2445627559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24554678-bfaa-470c-8632-c5734ede4fec/fizolajuxenemuruwibiwegab.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/kofuwulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0248142e-e72c-43b3-af5c-3263088b29b9/legoloda.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 3

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBC 5332 bytes
SHA-256: e6d1ab0ec03255303b79b803491b89c66b0893aa55d5a69dc1d1ad9f887462ec
font_01_sfnt_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 10580 bytes
SHA-256: dae1b86b5dcb77afcb037c61e9c4af927c902eb14e314e6c453a2cae9446901c
font_02_sfnt_off000102d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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