Malicious PDF — malware analysis report

Static analysis result for SHA-256 b623ae87c6e864fa…

MALICIOUS

PDF

87.8 KB Created: 2020-11-09 23:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1a37e5c407fcd0935f7b4e77378fbecd SHA-1: 14d03df57b732bd2c198b3386dff6f71c4d57781 SHA-256: b623ae87c6e864fa8356e7a2a7672c890920d1f0f4eb4cea1eee37c1992ccc72
156 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 ClamAV and an ML classifier. 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 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/123?keyword=what+is+an+american+essay+ideas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5fa4ebc51ae25.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/pafotudatarepekuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5f954c32cf50f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388173/normal_5fa1274dd247f.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/7217906.pdfIn PDF document text
    • https://zopojidiluze.weebly.com/uploads/1/3/4/3/134361294/jitukezalinadojur.pdfIn PDF document text
    • https://luvupomadimudux.weebly.com/uploads/1/3/4/3/134350134/1075337.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08c12ba-5963-4a61-a126-4e57fd523071/gigiribok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf9f206-ade4-4c3d-96e5-9c30452f2365/smart_10_balance_wheel_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6905e2a9-01cd-4c08-be92-9cdfd99d0f61/73633136442.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/light_bulb_holder_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/desert_monsters_tours_scottsdale_az.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8bac647-8e60-4653-9b9a-e730f7f67ae4/vurimofiligesosajivonozi.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/29615270596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce363585-2b9d-4af7-9674-2d78bbc4b2b4/toms_shoes_video_case_study.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 6568 bytes
SHA-256: f1bdafbd580f333fec724c6c472fa428f11528df848eb590c8508f49ed81df4b
font_01_sfnt_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 2888 bytes
SHA-256: d45bffd8f4d52b3758ab7dd016ebf4dbc0f721a4aa1c79de62a48853ac920b33
font_02_sfnt_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 5264 bytes
SHA-256: 2ab8c3275746deedd2800fe6a8b6d9988ed61872e94f02b18d9c664adff9015f
font_03_sfnt_off00012164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12164 2144 bytes
SHA-256: 93af4e918bad984b8524d74d0c53b7616aa16c0c87066ed3f300a460f6cf7f81
font_04_sfnt_off00012b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1E 10448 bytes
SHA-256: a0f80793b35fbbe5979d5c4fb37a6d126ba93bd3d91a52a1b1dc59e62adc7d94

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