Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1990dcdc415dcf9…

MALICIOUS

PDF

46.6 KB Created: 2020-11-06 03:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0046c720bade67ee23aec0db94ed8f81 SHA-1: 20dcd3db56160f0d87959b20bb31ed6c721d1c22 SHA-256: a1990dcdc415dcf9c93f303cb146b544dc36d9878d5e14b726504e2213d710de
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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.
  • 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/123?keyword=269-215-8310%253D-8256+is+true PDF link annotation
    • https://tafuposavibado.weebly.com/uploads/1/3/4/0/134017079/dc1633efd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_5f9f16955c521.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/nefomojuwet/dapofudipefipuru.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/suncast_snow_shovel_with_foam_grip.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/tugepejopugatiposanukafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a68d1955-64e0-4ccb-95e8-7d69a6ecf878/rocket_league_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/imperialism_in_africa_ww1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7140/4739/files/36592578431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac6bec6-64e6-4d02-9421-c73995a78457/crack_isunshare_windows_password_genius.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/8749266316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ee69b9-da87-4afb-b5ed-f3d92d770c9e/bomone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1ae517a-7e1c-4477-93b4-4aaacdc691b5/nuguzobasi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/6941/2776/files/little_women_monologue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a56c1c-48eb-4e63-a170-93e1e7f0f2d9/wipidunirinufajuwoz.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_off00007507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7507 5536 bytes
SHA-256: eba967af0b280bc0784ae0fa77b8fddfd15fd81d0477204ba5a58bfb3339ce2b
font_01_sfnt_off000087f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87F4 11712 bytes
SHA-256: 7c3926cfd9a1325be40ca0439a98907926b837dca2bf77748acfdf1a52810cfd

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