Malicious PDF — malware analysis report

Static analysis result for SHA-256 985356cc9b257d52…

MALICIOUS

PDF

74.9 KB Created: 2021-01-01 01:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2a6dfe7cfba0114309bfe92a03853f8d SHA-1: a8d44514d7dc0f5d9c77aed5479457ad62f4a869 SHA-256: 985356cc9b257d5211dd8c78572212cad75501acc0cb507db7311ad1e8fc4745
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external links, with one pointing to a suspicious URL that appears to be a lure for downloading an application. The presence of a download button heuristic further supports the malicious intent of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/strik?utm_term=robot+superhero+champions+mod+apk+1.+0.+50 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419846/normal_5fbdff4e91246.pdfIn PDF document text
    • https://cdn.sqhk.co/redixebu/lj1hgja/hamilton_rise_up_tour_shirt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370089/normal_5feb90347f3e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498801/normal_5fedbf849757f.pdfIn PDF document text
    • https://cdn.sqhk.co/nasonamav/bidohfF/82586712108.pdfIn PDF document text
    • https://resibifusonuj.weebly.com/uploads/1/3/4/8/134878176/9525366.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/fdihhd4/fake_caller_id_text_message_app.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/rupatojuko/google_phone_number_lookup_free_results.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/android_16_combos_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/jesepanexiregi.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/gps_tracker_for_keys_and_wallet.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/saleworaloxiraxiv.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 3516 bytes
SHA-256: 376204e4568235ef692d540d409787c40040249c1603ab8ccd06636ddd2a1211
font_01_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 5844 bytes
SHA-256: 05d853fcb0ae9e5b2ffcc76b4ca19e20c419272a36db6f2b537f059ad10d2dae
font_02_sfnt_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 10916 bytes
SHA-256: cde87e305020dd8a3efe55f8fc0235ecde40efa9b515b08e0b1ae73ee15d6db8

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