Malicious PDF — malware analysis report

Static analysis result for SHA-256 056c1b7ac4193b24…

MALICIOUS

PDF

62.6 KB Created: 2020-11-22 22:36:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f162cb1080c79de8ff73b41c6c08380d SHA-1: 292360a9f9aa9c13e6dea731bdb11c11e96dcd9e SHA-256: 056c1b7ac4193b24f0167f63e15aabfb3a4f5d06142af4696c6926fc00cd85be
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://trafffe.ru/123?utm_term=where+to+get+madman%2527s+whispering+rod', suggests a phishing or malicious redirection attempt. ClamAV detection and ML classification further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

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://trafffe.ru/123?utm_term=where+to+get+madman%2527s+whispering+rod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417139/normal_5f9badd03e7e9.pdfIn PDF document text
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/lamezidar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5f88ae9e13809.pdfIn PDF document text
    • https://kojemugolipoxo.weebly.com/uploads/1/3/4/7/134729864/6016593.pdfIn PDF document text
    • https://xukolewijox.weebly.com/uploads/1/3/4/3/134320036/597a7ce046bdab.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/jidagafinuxesu/33227455677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4f2eb7-6eeb-414c-a569-d5ebd596bbc4/kubuneginepoburelun.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/3260541253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9cd255d-49cf-4082-81c1-408607acbb1f/as_the_deer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bf01e2a-38e8-4b98-90c8-31fab9b243b8/laxiwunogujezerisow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f03d22-2dd2-4a4a-844f-37bfc17a6684/unshakeable_hope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d22316b-70ba-40f1-9302-1ad96a80c183/52500258503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36ecef8-0874-43fb-ac7b-250b278bc18e/59618489145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff6da79-5584-4a0f-8454-e83c2a614230/tulakijixavim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/403c9a35-4563-4ce3-a345-203a97763aec/dotinekasodomifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf6ca17b-df0b-47bc-9c6e-e9d6c1e72ffe/lomutekisadurifenokub.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB555 5480 bytes
SHA-256: 4dcb236e7e0cbaf009b31b3e7b16087d0997c62e627406889be27348eb18b4d1
font_01_sfnt_off0000c7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F2 10852 bytes
SHA-256: f663522df4bbe4a9734cd4b0a7e224d967ebcc29f79316c557647c80b760d2c2

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