Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3c1c451cb8e701…

MALICIOUS

PDF

82.4 KB Created: 2021-03-20 12:09:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c4bfd3f4b25e057ee9ae97b84bdd1490 SHA-1: 9a632d048fc42a3b6814dabf0e937509a55cc0fe SHA-256: 1a3c1c451cb8e7010399e67212a9cf1334251890885a2d7775d448c8a5595be0
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, identified by heuristics as an external URI and flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, contains text related to 'job batch and mass production pdf', suggesting a lure. The presence of an external URI and the overall malicious classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=job+batch+and+mass+production+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485579/normal_6013da00b10c8.pdfIn PDF document text
    • https://cdn.sqhk.co/menekilebuz/ahc86MC/puppet_pals_bonk_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/nosinoxogum/UEuhfjf/fish_sauce_dish_crossword_answer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413967/normal_6008b5ed28743.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/rorives/ciena_5150_configuration_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88873539-242b-49e2-90ee-7c87163487f5/6254115766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c29702-0349-4fca-8e9a-25d068a0208a/82747175149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e6618c4-8980-4f47-891e-dc1684ba1aea/fetowuboma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9737ca11-29c7-4711-ad58-3bdd1ce81402/28318450117.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/kalejes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5bcec08-f0b7-4512-bdfd-b866baae7605/1106897120.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/tcl_android_tv_web_browser.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/android_version_7_phone_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ea9ba5-e054-4c66-9155-d85f8100d28b/uniden_bc355n_scanner_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bab724-e47a-4e5c-bf90-c174a0058e18/attack_on_titan_fan_game_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b40a07f-4ba7-46bc-bb63-4e640b5aa47b/briggs_and_stratton_725_190cc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef827def-5356-4c8d-82a2-cd9e8fb832db/15613446007.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/waxobaselixojojoxutodavo.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_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 5256 bytes
SHA-256: 8248a49d5a68377add1414ec26e37c8c5eb0d41f588d0fb7b78ab1df4b766926
font_01_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 10888 bytes
SHA-256: 44546c6ee2ce60de66235f3fcf486442ae0788592b630e00f326b66419c2de87
font_02_sfnt_off00012ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA6 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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