Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc219329d6ffca5…

MALICIOUS

PDF

76.8 KB Created: 2020-12-26 16:46:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 37d631b0580bb8e2a8405186fdd54d86 SHA-1: 5010c0c681caea5964314a2327d25a6e8f273b6d SHA-256: 6cc219329d6ffca5be8fc1789d31b63f0ba1f3619d624253e2bbdaab62a52b8a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, many of which are likely part of a link farm designed to host malicious content or phishing pages. The document body, though heavily obfuscated, suggests a lure related to 'June 2011 chemistry regents answers', indicating a phishing or scam attempt. The presence of PDF_SEO_LINK_FARM and PDF_URI heuristics strongly suggests the document's primary purpose is to redirect users to external, potentially malicious, websites.

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://traffset.ru/123?utm_term=june+2011+chemistry+regents+answers PDF link annotation
    • https://mefarixikokupa.weebly.com/uploads/1/3/4/7/134759110/9264d881081ffe3.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/fotat_wamufeta_vujimanofot_maguxum.pdfIn PDF document text
    • https://gesoroserazam.weebly.com/uploads/1/3/4/3/134310447/fivotobimalibepali.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://uploads.strikinglycdn.com/files/9c921861-5eba-4ff1-a664-4bd6cbcbf43c/teal_christmas_lights_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3a7343-c5a1-4e7d-afae-f9c02a031091/52016554031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba92671-8510-474b-bb83-f94ea67cf862/48918807477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/823841b6-167a-45e1-95e0-fb3ef2f1b7ef/31827150385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b398983f-2e3b-4f7a-8c86-4b1541dc7efe/feudal_system_in_japan_tokugawa.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/ejercicios_clases_de_sustantivos_4_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/760c89ce-e618-4a9a-8e6c-c4a7f771b71d/five_characters_in_search_of_an_exit_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/employment_card_online_registration_form_pune.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/3329965344.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/story_of_my_life_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c096ba9d-30f7-4536-90bf-5c5c6840040f/34864339251.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/xaloxaxedaxumiraviz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 5464 bytes
SHA-256: 12efd464582609957136201ccf1e56d3396819182d598b55058b54a7ef40f65b
font_01_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 11020 bytes
SHA-256: c2f4943b1b7277b941ce8cd72be87cced7f5f950a426df34ec7d65ed025ca5da
font_02_sfnt_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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