Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1096915653fd19…

MALICIOUS

PDF

73.1 KB Created: 2021-01-02 04:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3ab3096c9f8ae57e1de14b29881813a5 SHA-1: 3845aeda989a7d78f572b2ed543c58dbf403bfec SHA-256: 5a1096915653fd1901ffd3ec550cb48e482961177ce1404a04a3b8ea8005410b
214 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, disguised with a search query for song downloads. The PDF also contains a large number of external links, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/123?utm_term=guitar+hero+2+songs+download In PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/noxatifexakeguxajumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482882/normal_5fad29d496fe8.pdfIn PDF document text
    • https://cdn.sqhk.co/xijisejes/hbhbjjz/mivufototovogezafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_5fa423101ada0.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/bb78486c-8905-46ae-ab41-921431d9e323/valiant_force_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25298474-b0af-4afa-a927-cd3e9aaa60ee/thrifty_car_rental_reviews_fll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3f08d5-5dc0-4d71-accf-dbaf30ab211f/essie_eternal_optimist_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c587e741-a496-4786-8ba6-7c711c8eedb5/ximetinidawixomumite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d1b279-c14f-4db2-a83c-58b280f255f2/zapya_apk_for_pc_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/65773972569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4680ee4a-b37e-4b44-87f7-12f922a9eb36/cec_conference_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/biform_games_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/renenifoloz.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_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 5340 bytes
SHA-256: f6f2a89b5c9fb0d45d8b56aed9db2165e59ab11183e5eb324757a897d4f7d4c2
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 10160 bytes
SHA-256: 0a3ebab25228c61e8b53bf3f7530c59ef9e59220873818d9761cccb3c62b11d9

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