Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73a5a2f6fbb21af…

MALICIOUS

PDF

67.9 KB Created: 2020-11-25 01:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ee92e1eaef7c11f9803584dc361ab5fc SHA-1: 1c1950dcc8be56fe72e7b0619855555cd724a922 SHA-256: c73a5a2f6fbb21af4e5a31fd14eb3793c96a4e21ef7fca4f8447fc0efe578f9e
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 heuristics indicating it is a phishing document and hosts a link farm. The embedded URL 'https://trafficel.ru/aws?utm_term=amended+941+schedule+b+form' is likely part of a phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

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/aws?utm_term=amended+941+schedule+b+form PDF link annotation
    • https://xapotitiguwux.weebly.com/uploads/1/3/4/6/134668809/busojefujo-jebugilativise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_5fa102fa01c1b.pdfIn PDF document text
    • https://juliraviwuziw.weebly.com/uploads/1/3/4/2/134267057/felijesiji_lubura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5f9a33c6e0214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f8727556c051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_5fa10c7c36125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_5f93ddd9ed4c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418781/normal_5f982fdcdee99.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/0dcfb9ee-292d-4d88-bdaf-06106efe81aa/potinuxezajov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f7f4201-45f9-44a8-9c04-218fee7713af/nonaliwurudezularefel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9dcafdc-f940-40ea-812b-5deefce71f56/wings_of_fire_mobi_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be226276-61db-4845-af06-bc8678b8d1c2/mewazisubamufaxox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b7a7b7-30c5-4310-85e4-122a9feae407/33154183835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e0809f-ffa0-49d8-84d8-85bc2806708f/classroom_observation_hive.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_off0000cb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB26 5476 bytes
SHA-256: 8674e1ff84f83c686ba4f56a8eee86788407e4357f8e752c9ea3af0cf55bb33f
font_01_sfnt_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 10944 bytes
SHA-256: 0605d281bb49c1533358b5a63ee8be6a71b6e93a6e8299707af34301c5ac82ac

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