Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb77b3852031925…

MALICIOUS

PDF

84.0 KB Created: 2021-05-22 11:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6031aa965380d1dd004c636738dd9890 SHA-1: 997cbad64784fd79094c94c90ab101041e8b8464 SHA-256: 1fb77b3852031925c4ed95531f124b40e1a3219b87233a5dd7c8d8d2bd9cf898
156 Risk Score

Malware Insights

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

The PDF contains a lure for a software crack, directing users to a suspicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm for SEO manipulation or malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://baarspo.ru/strik?utm_term=style+works+xt+universal+4.97+crack PDF link annotation
    • https://fubuwadedaxas.weebly.com/uploads/1/3/4/8/134897716/dowuvipujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_5fdbb07dadd1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467007/normal_5ff14a7d80553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_600e02134017e.pdfIn PDF document text
    • https://begosibaluta.weebly.com/uploads/1/3/0/7/130775163/pezutopifukoxisenum.pdfIn PDF document text
    • https://xuxudufekew.weebly.com/uploads/1/3/0/8/130873992/rezakuwasejuz.pdfIn PDF document text
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/wekukunoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_601d27ad21ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_600df0b631ea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466370/normal_6039a40ce43ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413705/normal_5ff44df7af046.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/fisulefajow/16804484723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d42e14e7-383a-495b-a274-a7c5db1bc187/fulltone_ocd_v2_overdrive_pedal.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/similitudes_y_diferencias_de_los_animales_y_los_humanos.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/38549661342.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/lebatun.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/alaris_s2070_scanner.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/rerukare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d12e09-94a4-45c4-aae0-204e4144f47c/samsung_galaxy_note_8_screen_replacement_price_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/femapirijarikomini.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/android_studio_sharedpreferences_get_value.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/81117675801.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/72308602452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb61281f-701f-49d6-9e95-0444751f0633/how_to_connect_hopper_to_hopper_xbox.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 5640 bytes
SHA-256: 77370c75c05e731f771bb4910362348caae3d89c48daa5a5642855ca01684764
font_01_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 18052 bytes
SHA-256: a1c73452eee01b6ce2e1f3e3618e32d19b6584954db24f987902a3c5af93e920
font_02_sfnt_off00012b54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B54 16160 bytes
SHA-256: 25a5e6c7c9cd73e1730f271d334b71b3c0ac6385951e3737251623a68d8eef5c

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