Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9dd7bf1ce85b18c…

MALICIOUS

PDF

94.1 KB Created: 2021-03-28 22:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4f05bd68cd9a34496470472972359e47 SHA-1: 547af2abc7d8fdc86fb448c5447961497b3424bc SHA-256: a9dd7bf1ce85b18c9080857baeb3210d38f70d040638e557df06e1e0f585b898
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/award?keyword=tnpsc+assistant+system+engineer+notification+pdf PDF link annotation
    • http://carbags.site/a_return_to_love_free_bookuivug.pdfIn PDF document text
    • http://tedujutof.iblogger.org/casio_ga-100-1a1er_instrukcja_po_polsku.pdfIn PDF document text
    • http://site-shop.xyz/alto_shaam_ovenpfa3w.pdfIn PDF document text
    • http://mangalvpodarok.ru/bobali1rra2.pdfIn PDF document text
    • http://dawajilimomod.iblogger.org/jebarabugexeka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mefadedosuw/yantam_marathi_song_video.pdfIn PDF document text
    • http://jegajumofi.rf.gd/minecraft_maps_1._14_free_pc.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_d38c4a6cf8a0491f9a727c331b03ea8c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/tecnologia_da_informao_e_comunicao_significado.pdfIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_5d26596dbfcf41d79ffc671c2d1255f3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/vafezulumovevirezosadaz.pdfIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_a04de13c6c144718833e778aa6e76eef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legenapi/33083537867.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/elder_scrolls_online_strategy_guide.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_166f5f6622444704a4bd75a1ebf28bd0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/best_stroller_compatible_with_chicco_keyfit_30.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/xejurifofupilidesudizage.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/moxadetovegorulikixaru.pdfIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_6133316d6c1a410f80534174f024b8aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajujiju/calvin_klein_formal_shirts_india.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 5284 bytes
SHA-256: c9f5945d8d70fdb5bb3d49fcd51f3ecedfe23c1c002331645b83e9ac47fabc28
font_01_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 5284 bytes
SHA-256: 375d62854e2f59a77bd6324aef4442f47c948e014e86d5d0fee89259d5c6b831
font_02_sfnt_off00013436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13436 11948 bytes
SHA-256: c9ce1c3c01009c5dc4c63cd2d0f1ba341ddef5cf404c3d635c4f46bddc28ea16
font_03_sfnt_off00015bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c