Malicious PDF — malware analysis report

Static analysis result for SHA-256 8381468e3ce08a24…

MALICIOUS

PDF

95.3 KB Created: 2020-11-08 12:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d121de71d966b5244c21caa20a33ac1e SHA-1: 9bad3a2d31d170a870ad5bb7979f11649e69f627 SHA-256: 8381468e3ce08a240b02ef09926b536824d4a36f2a0cff3b4563259dc3373d84
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://trafffe.ru/123?keyword=22554+is+in+what+county PDF link annotation
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/konew_dipubaz_morumeverefur.pdfIn PDF document text
    • https://wusinetowaje.weebly.com/uploads/1/3/4/4/134471696/31945d6dab384.pdfIn PDF document text
    • https://bidovakufizal.weebly.com/uploads/1/3/4/5/134586087/tasojilakobag_butifi_ruteso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_5f9fbbbbf0fc7.pdfIn PDF document text
    • https://nipogoloduvi.weebly.com/uploads/1/3/4/3/134368022/zunoloridu.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/8927150.pdfIn PDF document text
    • 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://uploads.strikinglycdn.com/files/62e158e0-5361-4042-b646-032df322e052/dizuvirofegapinupar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2515c5bb-1071-442c-8ea2-4d5af35db9aa/rolarubobekakufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9334a16-a282-488b-ab24-ff8ae9fee479/los_cuentos_de_las_mil_y_una_noches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5bb5d6-9d01-4ea8-aac2-e4267513361c/seven_spiritual_laws_of_success_chapters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2987f196-14b1-40d6-ab72-47574607349a/fafixijitelexujukunajixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b981faf-9bdf-489a-9903-6481f1a3a5d7/popoxawodagugixik.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_off00012a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A27 4968 bytes
SHA-256: d9845bbe1b95d39eec068650bce3a5dbf1be112f73ea13a9e2d057ae7c09046f
font_01_sfnt_off00013b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0C 11984 bytes
SHA-256: a92e476281218a344aba926c0141fb9d25a8ccfd85c2fabbea2a2aa15c583a9d
font_02_sfnt_off00016248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16248 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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