Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44e39dc53f6be8b…

MALICIOUS

PDF

69.9 KB Created: 2020-11-20 12:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0a8f404a8b060cfa17af043ec8d72e90 SHA-1: 2d79bbdfe0174c69de060ec6936cf852188139cc SHA-256: b44e39dc53f6be8b87415c62828b0818daf3ed4a838bec9e3fe61b5af3f11f03
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafficel.ru/strik?utm_term=torchlight+2+paladin+build PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454820/normal_5fa605063f07f.pdfIn PDF document text
    • https://jawiniralegewo.weebly.com/uploads/1/3/4/4/134492986/dujesu.pdfIn PDF document text
    • https://gokejubekilebu.weebly.com/uploads/1/3/4/3/134376129/c2a1f7ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_5f8e8a77b94c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2422c8a8-62ca-4e0d-8049-61f7bb3fa830/kozur.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/15383147301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4681055-8684-4112-93b0-840ea5f093fa/nejosivaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87bf953c-f0f5-4503-b1a3-696f7a9fefd2/guvuzabijanog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a31814-da60-42fe-8c23-f1c23b6decc0/24450673321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca602bca-455f-400d-bfdc-4ca93ccf50b8/tilizotokoluxukavidoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0dbf19-c799-454c-8481-ea6708945340/micro_mezzo_macro_examples_social_work.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/11894783528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df47b9f-9898-45a8-802a-88c431b0705c/fofabemokogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d798a2-17d5-4b49-adc0-4c496fabd539/dalizir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7438c3f-4fe5-4ad0-aeaa-5f98fae8e99b/how_to_enable_command_blocks_on_mcprohosting_server.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36d00cd3-a631-4182-8aac-eac442ba2583/xokemoxarakexuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63a2a5b1-5666-4c98-b8c0-da380c43a35a/future_save_me_zippyshare.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 8

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_off0000d25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25D 5380 bytes
SHA-256: 837e9fa7701c64ef528022b226109ea8df5a86eeb52e2a09be81740836d3ab2f
font_01_sfnt_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 11544 bytes
SHA-256: 7f59df08a1c887828e26bd5773ec8ba47754e8a777f146f87a1c73ff518f2775

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