Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdee8e3daa749a5e…

MALICIOUS

PDF

49.4 KB Created: 2020-11-06 02:23:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 38988075eaf930695e00f76943ed0ac0 SHA-1: ba4a0d4a4a08ff1debe819c72d01a5fa16fae7d7 SHA-256: cdee8e3daa749a5ed8c010af8396680b37b1164c94357b06f1a2cdce1d3ed2e1
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm and a lure related to 'accounts payable', suggesting a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external links, including one pointing to a potentially malicious domain, indicates an attempt to redirect the user to malicious content or gather information.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://trafficel.ru/aws?keyword=accounts+payable+is+a+credit+on+trial+balance PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ritoma/bill_murray_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac9c4a1d-abd6-4fe9-a4f8-768083c320a9/23450734693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5b4efd-b598-4c72-9c23-17efb5b1ec87/66704813819.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/autofoam_soap_dispenser_1100ml.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da60da17-6c24-4142-8cac-190c0ce64162/gitolizitiroja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85062ab-883e-4cf4-a1e5-38a3407e13c8/33201052454.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1841/9876/files/miles_river_middle_school_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/586482b7-1fe1-4918-a309-6c6882b8c608/zowiwojuzosotudosur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/161dfd6f-6e42-47bd-b149-e17e1be93ae0/84317144395.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/xodubovulovavimijavekufud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b84afb-5884-4b4a-ae46-71648135d9d5/xagofexarebosotupugulono.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4935/1846/files/area_code_623.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/activate_hbo_now_on_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/problem_based_learning_journal.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76CE 5180 bytes
SHA-256: f8f45976172359395f287df517a5f79e0e09981893f6415a7cf12b31efca1d44
font_01_sfnt_off00008874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8874 9872 bytes
SHA-256: ac6995f47b0174d6f5c64eacd4ca18978a1c9dc2b17e8658d668a60e4ebcfed9
font_02_sfnt_off0000aa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA36 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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