Malicious PDF — malware analysis report

Static analysis result for SHA-256 a946c082aa4474a9…

MALICIOUS

PDF

71.1 KB Created: 2021-02-17 01:21:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: be1dab0a6359e7cc0a6bcd5a04b78ae9 SHA-1: eb31828a06471e82de757d2ea777048717c480b3 SHA-256: a946c082aa4474a9e07bc7c7820002c4d941a8d9cf56fe1761ca1e892c7ce1ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files. This behavior is indicative of SEO manipulation or a phishing attempt to drive traffic to malicious sites. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/wb?keyword=crossfit%20wods%20with%20no%20barbell PDF link annotation
    • https://cdn.sqhk.co/rufebumu/vQghYVa/thumbelina_story_book_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/gjijjjn/pac_attack_game_boy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_601436362f695.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369519/normal_5fe0e7844f2a3.pdfIn PDF document text
    • https://cdn.sqhk.co/poxufape/ggicab7/liar_s_dice_pirates_of_the_caribbean_rules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5fdbb24c20dab.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/ibOghjg/hydraulic_calculation_software_for_water_supply.pdfIn PDF document text
    • https://cdn.sqhk.co/jawafurovif/iamjgJO/i_don_t_know_cartoon_face_maker.pdfIn PDF document text
    • https://cdn.sqhk.co/fixefalid/Liejjjh/mipapujuwazidipowasuwipuj.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/gdhgdgg/samsung_split_unit_ac_error_codes.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/SPLhXqk/75764224885.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/LOhcxjc/minecraft_pixel_art_templates_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/bafaluminowi/hjdSaje/mix_new_apple_ringtone_2020.pdfIn PDF document text
    • https://gosidobesek.weebly.com/uploads/1/3/4/0/134017516/daxufopolokewilaju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_602b2725d6012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_601d9c5d101fc.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/ngi1O4C/25232521588.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/hahdYic/65301597215.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/gegdkjd/environment_include_exclude._net_core.pdfIn PDF document text
    • https://cdn.sqhk.co/xewiliwilax/gchhyhd/earn_free_talktime_by_downloading_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/hfYhjCw/download_mymtn_app_new_version.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/pF2jajh/rimajuvaxoxujezaxobufugej.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/iaAoyhe/sejabidobomotep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 5132 bytes
SHA-256: 1a13d72c2f9c882d6c40ef2a3f62b5f62e80b989a5b2453d906e9e4a5d56e90c
font_01_sfnt_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 10592 bytes
SHA-256: 45b84c7d45c4d356c067080b0fd219ba5a1e16c3c645c9006ea93a21e70d7c72

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