Malicious PDF — malware analysis report

Static analysis result for SHA-256 203c60e7be9c42d0…

MALICIOUS

PDF

78.8 KB Created: 2021-01-10 00:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f3ae858fbb31cbbc94331b957e17449 SHA-1: e5d1cfac82723b052dc0fc2edf8fc1e9a18da715 SHA-256: 203c60e7be9c42d0c2ad392329dc530426be0a884aff834fd8a8919b9774dc4f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO poisoning. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/123?utm_term=animal+farm+battle+of+the+cowshed+extract
    • https://kozegefiseram.weebly.com/uploads/1/3/1/3/131379202/siwarapatonemi-kidax-disizinon.pdf
    • https://site-1231206.mozfiles.com/files/1231206/write_sms_by_voice_pro_apk.pdf
    • https://site-1171373.mozfiles.com/files/1171373/dunk_line_advertisement.pdf
    • https://cdn.sqhk.co/wirowanorax/igTgvgc/43408786864.pdf
    • https://site-1194646.mozfiles.com/files/1194646/mobile_manager_app_asus.pdf
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/ronewug_gafixunuv.pdf
    • https://cdn.sqhk.co/xotabuti/gjcF1pJ/squidward_crash_test_dummy_gif.pdf
    • https://gosasomaf.weebly.com/uploads/1/3/4/3/134370397/5234477.pdf
    • https://bufezemaz.weebly.com/uploads/1/3/4/7/134714495/a96a8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kizugokofo/apple_iphone_6_plus_diagram.pdf
    • https://s3.amazonaws.com/lekizopiloref/beholder_po_polsku.pdf
    • https://s3.amazonaws.com/fasanag/57057903089.pdf
    • https://s3.amazonaws.com/lupuvogotog/change_icon_search_view_android.pdf
    • https://s3.amazonaws.com/salosibejodod/free_rider_unblocked_66.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f90d.bin
5c118f4d980a21eb03630d676db43012eafa62e94d299125eaea3ddd8b9c70d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 5552 bytes
font_01_sfnt_off00010bd2.bin
105ec22a48bb2fd130c63277de4dbce08dbdca621fd7c4e45e2ac6617d26608b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 10136 bytes