Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c685a6097f9a89…

MALICIOUS

PDF

68.0 KB Created: 2020-12-16 22:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 60cfa828586e7d9474b11e18ef5af19a SHA-1: 6c38bc94fc4bf7eef0350f8d973dcef5e01c68a4 SHA-256: 57c685a6097f9a8971063eca8bd866c41c2fffae595b86d609bc5e6e6c817fa6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which are likely part of an SEO link farm designed to manipulate search engine rankings or distribute malware. The presence of a critical ClamAV detection and a high ML score strongly indicates malicious intent. The document's content, though heavily obfuscated, suggests a lure related to 'Hacker app store apk', aiming to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=hacker+app+store+apk PDF link annotation
    • https://lalonofinesuver.weebly.com/uploads/1/3/4/4/134442061/memezur.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/vaxavot-mitowijubub-sozodoluvirasad-kegazuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f93ee7b5b1f9.pdfIn PDF document text
    • https://jitebogegamoma.weebly.com/uploads/1/3/4/7/134761197/8153941.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://s3.amazonaws.com/regovadeje/39950529068.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2c1b8e2fce462bc98012e/t/5fd078273364176a125d2979/1607497767456/extreme_car_driving_simulator_2_mod_apk_hack.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5c6758139af0376668248/t/5fd66e1e164d0f203c7d3bda/1607888415609/tamitojizepubizadevex.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/facebook_riddle_answer_7_am.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/watch_gundam_wing_online_english_dub.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10fb5bda9c57a97bf17be/t/5fc170a75147b1480469ba8b/1606512807254/wipofujuwujefonenu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdedd95895864d89531a1f/t/5fcf72ab5c8977691e3cfc12/1607430827455/lanuretojikimawivufibavez.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_off0000c2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CC 4556 bytes
SHA-256: 798921c6f3382a5ab31e673ea611b924880f83c63bc70bc4f32ae2751190d003
font_01_sfnt_off0000d249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD249 10268 bytes
SHA-256: 7869b22b9cefbc98930c600c952d27a1d5a39a2bbacd1217f50692e75f10c558
font_02_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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