Malicious PDF — malware analysis report

Static analysis result for SHA-256 74760fba5f3d59de…

MALICIOUS

PDF

72.0 KB Created: 2020-12-31 09:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 01338ed995ede29473da1e99688728cf SHA-1: eb5fba0a5c760f07e6fd6054d5e7389602b7e37e SHA-256: 74760fba5f3d59deb2eb22cb4ac3d2c4f32fe24f49124430d9f2168fb0b2de08
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is designed to host a large number of external links, with one prominent example being 'https://traffking.ru/strik?utm_term=bluetooth+low+energy+terminal+windows'. This pattern is commonly used for phishing or distributing further malware. No scripts were extracted, but the presence of numerous external links points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffking.ru/strik?utm_term=bluetooth+low+energy+terminal+windows PDF link annotation
    • https://dinurafilaxu.weebly.com/uploads/1/3/4/6/134621410/5c9d00.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/3538613.pdfIn PDF document text
    • https://retibome.weebly.com/uploads/1/3/4/6/134680472/8eb12d54ba01.pdfIn PDF document text
    • https://novebeze.weebly.com/uploads/1/3/3/9/133997241/koned_lolisugure_sadipagomunan_fanora.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/3062e5ed-209c-4d64-a513-57fd80d12f5d/songs_of_a_dead_dreamer_and_grimscribe.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/android_builder_pattern_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c105a740-f181-414c-8c93-4bbddcd966f2/ice_cream_roller_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/the_crow_and_the_butterfly_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/93930761534.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/roroteputog.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_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 5484 bytes
SHA-256: a0c608b229f97d7fa3e75a112e13edc33e5186e07b36370fd2e194c8a2db935e
font_01_sfnt_off0000ef45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 10504 bytes
SHA-256: f7f4712c8852234207d898a57d0b89285269812cd103175aa49753e0f7150101

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