Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd35c1a1c4dcaaa…

MALICIOUS

PDF

77.7 KB Created: 2021-05-30 06:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 923bf137ba6241dea3c490df0e815e70 SHA-1: 954e3bf1121f2119f56c621cfc07f64ff7c5a545 SHA-256: acd35c1a1c4dcaaaac5281faeaf288395fd60ffd64e3ae3335db076e17528b4c
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=recurring+terminating+decimals+worksheet PDF link annotation
    • https://gixejeti.weebly.com/uploads/1/3/4/3/134326891/8724d2fdcc54f96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461229/normal_5fce242cb8a5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420244/normal_600735c4e78a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490754/normal_601471d5129fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488566/normal_5fda806871320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_6060e25281462.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380858/normal_5fcf0106e5e66.pdfIn PDF document text
    • https://sogegagep.weebly.com/uploads/1/3/4/6/134687839/3011229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_600c25247f53e.pdfIn PDF document text
    • https://pesopipuni.weebly.com/uploads/1/3/2/3/132303043/8069150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471083/normal_5fd096a902a17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383571/normal_6034f462bc50c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_605d15fb935d4.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/f6cbce63-9364-417e-aa5e-aae093ebc146/somafogizirerogegonaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44dc9de-ac9b-43ca-9800-5e992e5c1a35/black_and_decker_iron_temp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031cb8ee-af9a-4832-bc55-654f03dcad8d/husqvarna_445_rancher_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1804757b-b897-4d9a-b663-59babe622587/what_kind_of_sim_card_does_lg_g6_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e8d3d0-98c1-4503-b1bf-f6d9a9147306/alesis_dm6_electronic_drum_kit_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa4e744-fad3-489d-93db-ffeafe16844b/costos_de_calidad_slideshare.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_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 5400 bytes
SHA-256: 37ac7576147109102e5b3ee4ef87009ffbf2887982a4535a1319ec55a0ecd6a4
font_01_sfnt_off0000f4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 11240 bytes
SHA-256: 87a7edc5ae7d219e34e08d73d782d1a4ea65cbfbe79dcb811faa299cb49f1bfb
font_02_sfnt_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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