Malicious PDF — malware analysis report

Static analysis result for SHA-256 06df636219f5f075…

MALICIOUS

PDF

72.7 KB Created: 2020-11-07 23:35:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c55eb099c7e9f6cf8277815d39d3c0bb SHA-1: 1dcc1c45d6687ca3e5786a32fd147120f1c0cc57 SHA-256: 06df636219f5f0755b6dcb862b6e6da2434c50a2e3fc803eaf755ce5615a9a75
164 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a fake invoice or payment lure, and it includes numerous external links, one of which is a SEO link farm. The ML classifier strongly flagged this PDF as malicious. The embedded URL and the link farm suggest the document is designed to redirect users to malicious websites for phishing or other fraudulent activities.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/aws?keyword=fdot+toll+enforcement+invoice+payment+florida
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/8270395.pdf
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/lekiketosavusanasuk.pdf
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/099ba.pdf
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/9867618.pdf
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/kawudadupug.pdf
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/1f26aa0da8609.pdf
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/4443116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ruxudaverotu.files.wordpress.com/2020/11/tinalam.pdf
    • https://tatosotodu.files.wordpress.com/2020/11/giwijusit.pdf
    • https://uploads.strikinglycdn.com/files/2ffdafc3-7441-4ac9-99a4-4702bc98e5f8/72008789818.pdf
    • https://zakinasojij.files.wordpress.com/2020/11/lazopixoxuwozevewipeva.pdf
    • https://zitatotifewe.files.wordpress.com/2020/11/razudivabopebifenopi.pdf
    • https://uploads.strikinglycdn.com/files/328228cd-7e1d-4413-93bd-c656472579bd/karaj.pdf
    • https://uploads.strikinglycdn.com/files/1aa849f0-d67e-4b87-a672-1140d2137268/xipadakawejeju.pdf
    • https://pewivawo.files.wordpress.com/2020/11/zefigebivekevo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d516.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 2828 bytes
font_01_sfnt_off0000df10.bin
56d5f11af0a84046483ececeac6ec94c7305a6d7ce9ddcc27e0bf5d78116fdd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 5240 bytes
font_02_sfnt_off0000f0e1.bin
dbc921d9ae5b98f6f477e6b6edaf1264ff289c5d8cc42a5776799fcc950236bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 10572 bytes

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