Malicious PDF — malware analysis report

Static analysis result for SHA-256 addf4ab447f78c58…

MALICIOUS

PDF

74.5 KB Created: 2020-12-28 19:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 05a214c61156047935c2ffbfa2eebcb7 SHA-1: f4374d03b0059b1194bfc7d651688930b11b0113 SHA-256: addf4ab447f78c58035ace512b6f0f1100ff008cc88fbcd950c4f3bb5d421ae7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated or use numeric slugs, indicative of a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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://traffine.ru/strik?utm_term=bike+racing+3d+unblocked PDF link annotation
    • https://cdn.sqhk.co/nafolekuge/Qfocijn/53429110665.pdfIn PDF document text
    • https://gavizule.weebly.com/uploads/1/3/4/6/134659779/40dadbaf076840b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_5fb3f6e0de6b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5fbbc72d4141b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5f8b8b7407a9c.pdfIn PDF document text
    • https://cdn.sqhk.co/lamikolo/lhejjha/theme_parks_sentosa_island_singapore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wanalovum/the_banner_saga_2_apk_full.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/gerunds_as_subjects_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e305644c-9112-417c-af4d-7b8e390e5714/nasal_polyps_treatment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e700c84e-1a73-4213-945b-0f83574174d7/bolowopigexita.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/77894988744.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/gutonizomedimata.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/the_flick_annie_baker_monologue.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_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 5344 bytes
SHA-256: be2591d1497d127d077654094a83f0e87f9142d459bca4f993df45756fa7fd51
font_01_sfnt_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 10816 bytes
SHA-256: 990cccfe8df4ed7f81912b31be1a09b5973c9fcaf600d7341f7758c2b98f9a27

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