Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ac395bb0a2435f…

MALICIOUS

PDF

71.0 KB Created: 2020-12-24 11:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 42250d3627cce2d70aa18c4e8d88edb5 SHA-1: 7b2bbfcb221b3e177eb683eaaf4cdff7024f55c3 SHA-256: a3ac395bb0a2435fd4b437fade936bef59a034487d4bc2f48f3f0bb482b5ac7c
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, likely used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=g+string+underwear+wikipedia PDF link annotation
    • https://cdn.sqhk.co/lizupasepafu/Tjhjchc/35258959895.pdfIn PDF document text
    • https://cdn.sqhk.co/fakobijo/hjh8Sje/55021340961.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/45b196b4-107b-4089-995c-3ca3d84e261a/bulafit_keto_fuel.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/rating_best_ot_in_2020_draft.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/birthday_invitation_templates_email.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc49000-e261-48a9-ad74-809d95cbe2e2/53590584188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8210f7d2-2e80-40e8-86d7-6d7bc854c9f1/20981570439.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/birkenstock_shoe_size_guide_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/accident_report_chattanooga_tn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df678a7f-ff79-4b5e-988e-bae529e94a3b/fender_squier_cxs.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/96927628454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3339946a-fb4b-40e3-9bb4-d46534d0a79f/ludebaxutegodezoxedebusag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f748ae13-6b92-4a09-832c-2248162fe14d/sat_subject_test_biology_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/devils_lake_fishing_report_woodland_resort.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1837e29-3cc3-4956-83f3-2e5431c7e6d6/wisurup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c667259f-02c6-4021-b971-f5b177d6aa20/sony_rx_100_m2_review.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_off0000cded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDED 3508 bytes
SHA-256: 0a461c4e38c5c2a6ac5702b6a48c303d9e1b238ba6edf1266d9e95b14fd3a5cc
font_01_sfnt_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 5284 bytes
SHA-256: 71651fb045a4a790b72eecdc895bf58e7ff3b633d18bd4f8d77775600c34c786
font_02_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 10156 bytes
SHA-256: f716f59e5d593fc42a5f9b17f7ea53704603d9c6f11f11bad328b3fc714ec9f5

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