Malicious PDF — malware analysis report

Static analysis result for SHA-256 2886637d48d3d27b…

MALICIOUS

PDF

77.7 KB Created: 2021-03-28 09:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 70e8e7be67558e0399bb646e130f7b68 SHA-1: 0b680b412a93628ba0a76ddb59b96c20f161906e SHA-256: 2886637d48d3d27b258016e80e446c641e63f58e118457393d2d3df2f1a46103
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics and ClamAV, specifically flagging it as a phishing trojan. It contains a large number of external links, with one prominent URL leading to a suspicious domain. The document body, though heavily obfuscated, suggests a lure related to a 'staff appraisal system template', which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://maypoin.ru/123?utm_term=staff+appraisal+system+template PDF link annotation
    • http://gmetry.online/22318327458yauy1.pdfIn PDF document text
    • http://astropsychology.website/jaligukapenx3d2.pdfIn PDF document text
    • http://salonly.xyz/scansnap_s1300i_scan_button_flashings3ejq.pdfIn PDF document text
    • http://presentinsta.site/mefogigerozuxinamu3ktux.pdfIn PDF document text
    • http://naturebiolog.fun/79605963811szz87.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/anthrax_paintball_jersey_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/what_is_an_american_reformed_baptist.pdfIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_ae56bb51b41a4c0c8b47ea165b8c2669.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2737694e-5c33-4cef-ab1f-a520ecdae612/14509274869.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_da5ad40871814180aa29c2adda26b458.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b256b8-4cd2-4f0b-b36d-a8069b26114c/canon_sx160_is_accessories.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/19988436581.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/task_assignment_schedule_template.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_7af396219b6248329d02b556113c1bb7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/65207b35-0d6e-4351-8cf0-83ffdc29e619/92304898800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f4ba80c-5803-4982-848b-eb2386eed773/zugakopigisopudotim.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/dimidevok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32361601-5600-4700-8c53-bda4859812c1/braun_millennium_series_wheelchair_lift_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/mole_concept_class_10_icse_numericals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd3527d7-8c8d-4bdb-9e5e-4d4b7e97c069/73021655240.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/85077066930.pdfIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_a5bdb418c9464d25903a84bf52e8ac1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/705110a6-1cea-42f7-86d1-f2ac9bb64527/88084195566.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/math_answers_slader.pdfIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_b5286dec0a3f45acb6c423ed783fa35e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f869ed4d-315e-407a-a06f-2e53f2a4de53/how_do_i_convert_a_keynote_presentation_to_powerpoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39d2ac8-ec15-4f19-a237-31a1399087fe/nawivopepujujuzo.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
    • https://archive.acas.org.uk/index.aspx?articleid=1438In 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 5252 bytes
SHA-256: 759a0e254a1122ba561b7cb0904a039cf125a323b641c9c59ea71514c2498f38
font_01_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 10620 bytes
SHA-256: f3dd5e81206c4674891228fbda05c3a3d94b710f765fb78e4b3a0e9966f44bc8