Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35ad624b245484d…

MALICIOUS

PDF

74.4 KB Created: 2020-11-19 05:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bc775c76c07a7a4096da5154865affc8 SHA-1: b8fc0cdc3d094a0e774cf3c7a0dab7f2e97bd9c1 SHA-256: e35ad624b245484d57599e996a19adfce0379d9621134f330d184dd3c101c57e
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple heuristics indicating malicious redirection and link farm activity. It embeds links pointing to a redirector URL, which likely serves as a lure for phishing or to distribute further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffine.ru/aws?utm_term=stream+of+consciousness+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f97eacf76e05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_5f91ae486d5ee.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/4699356.pdfIn PDF document text
    • https://debawusajatowi.weebly.com/uploads/1/3/4/7/134707072/b63a88776901.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/6fdd49000103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457590/normal_5fa0caf79f789.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/henghuili-files2/larutizisewideneguk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dade8890-df15-4edc-a072-ad1478da8597/89852881495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e528da1c-fd03-4f1f-baf7-f59b86635685/7532338598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01b5c57-17f7-4b81-be9d-d6394347af0a/68572250369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49fe959-dd05-47dc-8b3f-423dbd6816c1/5276087414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80a90a74-7d63-495c-a059-ce75be5dcfa7/40883282240.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

Related samples 8

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_off0000d1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 5372 bytes
SHA-256: 1f17af1d54ce7e0b1377e8c5df525cb270b734a4e5e7afa28c5c5874837112e3
font_01_sfnt_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 10624 bytes
SHA-256: 77df8c2b4aef0dd13e1bc212a7841062dbd2a81ae14bf62b356d62b957dd2c9a
font_02_sfnt_off00010816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10816 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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