Malicious PDF — malware analysis report

Static analysis result for SHA-256 3395425cc13b29a6…

MALICIOUS

PDF

71.5 KB Created: 2021-02-06 07:27:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5460cc140e1902c45613e89bebfe4a14 SHA-1: 0cecd1e414c0a129dce5ce80f9b772e7d936bf7b SHA-256: 3395425cc13b29a676473b458905e1cbca319190f6186c2e9af994e87db04af5
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 detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an external URI pointing to a suspicious domain, likely intended to host malicious content or redirect the user. The document body, though heavily obfuscated, suggests a lure related to a 'checklist app', aligning with common phishing tactics.

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://crophysi.ru/123?utm_term=building+a+house+checklist+app PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380405/normal_5ffb1d7c35cdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473023/normal_5ff76ca310c96.pdfIn PDF document text
    • https://cdn.sqhk.co/kupibetefuko/uggps7X/cyberdog_camden_dancers.pdfIn PDF document text
    • http://sport-stavki.fun/boris_and_the_dark_survival_song_1_hourk7owc.pdfIn PDF document text
    • http://ubzvp.com/penizabogafozafu0t1.pdfIn PDF document text
    • http://namedaun.fun/heroes_war_counterattack_com2uscil18.pdfIn PDF document text
    • http://clientesdkb.com/slither.io_apk_mod_androide5tu1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459467/normal_5ff9d48720d51.pdfIn PDF document text
    • http://abzac.me/64781239349hdjkv.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/njhidhe/crazy_taxi_apk_download_uptodown.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_6006e97c992e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_600bc722429f4.pdfIn PDF document text
    • https://cdn.sqhk.co/fopavege/MIkjc0W/jomiwizedigoninomefapa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5fc71e1071305.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445880/normal_5fe27f2cd74fa.pdfIn PDF document text
    • http://3gusevshop.space/exercise_32_anatomy_of_blood_vessels_fetal_circulationxmd81.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/vavebufevodutob/cara_menghilangkan_watermark_pada_adobe_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/chainsaw_sharpening_guide_for_dremel.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/police_message_in_a_bottle_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/60636202441.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 5352 bytes
SHA-256: 84273db81cc210a25c27cc38169a1bc4e4810f0b5706e45fea0e656b4dcb1c05
font_01_sfnt_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 10552 bytes
SHA-256: 39fdd08aabc178db1da41f47d01ca16d448333fe2175efa2e27228623a773ba5

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