Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a42338b983bbf6…

MALICIOUS

PDF

45.9 KB Created: 2020-11-06 13:28:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 050a94ffaeedd05be7ab05b560091e4f SHA-1: 8782409cde7b2feecb22fff4101cf55384d7182f SHA-256: 77a42338b983bbf6c34382218908d950f851b296ba68636e4ca3f5c080ad8bb1
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which point to potentially malicious or SEO-spam content. The primary URL identified, https://trafffe.ru/strik?keyword=types+of+catapults+in+middle+ages, suggests a lure to a website that may host further malicious content or phishing attempts. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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/strik?keyword=types+of+catapults+in+middle+ages PDF link annotation
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/a692d4a32f0.pdfIn PDF document text
    • https://kizilezena.weebly.com/uploads/1/3/4/3/134354573/zutegidiki-fubivovu-rubesugarego-bugumaxegatarik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387577/normal_5fa4cd6038dc9.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/977e11dc-1254-48d2-b089-18c485cbc925/2002_mercury_sable_repair_manual_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9016e6-88cb-4cee-b5f4-3ccd2c4dbd46/tanivawixunifu.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/33707096182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e21f67b7-78cb-4777-bf65-eca9a134abbd/zikalojapimogipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f81bfb90-68bb-4def-85f3-9b4a497bc9b8/easytrac_login_ny.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/tubazexoxidasadaxusike.pdfIn PDF document text
    • https://s3.amazonaws.com/tagorarib/zapajop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5879e5c-f208-450a-9dab-082b7bf57dbb/5591780136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/569a7ad1-9f77-4049-8968-c14ae875de63/31932474980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8730feeb-6de6-4fa7-aa4a-bd661b5b6a92/12102746482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e637ca59-ec00-49e9-880f-f6fe7e42b3e3/dilugiduk.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_off0000684c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x684C 5312 bytes
SHA-256: a03ab107c954ed41bf6ac26ff1513abffcd589eb870631be02ef6de6712b9130
font_01_sfnt_off00007a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A56 10024 bytes
SHA-256: 1c829b60bacc9a69235c27b7d2d9146b05d8ddcbfce9fe225d9ec19c690004a9
font_02_sfnt_off00009ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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