Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78c8b1357f95c85…

MALICIOUS

PDF

84.0 KB Created: 2021-04-05 11:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 999773ed859079e9be29ae6ec4cc6fbe SHA-1: 211e76b777a2760a89188cec1982c35a8c6382d5 SHA-256: d78c8b1357f95c8547e1b2433886a1ea343009c828f664cfa9771801e5ee5035
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/strik?utm_term=who+is+the+killer+in+who+is+killing+the+cheerleaders PDF link annotation
    • http://lamanixumerad.mypressonline.com/85949441727.pdfIn PDF document text
    • https://nililekekikare.weebly.com/uploads/1/3/0/7/130739967/lewedanaje-lusixivufuwo-jafura.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/gghiWjd/64111838871.pdfIn PDF document text
    • https://cdn.sqhk.co/wedifedaguju/jeWvamU/14473186405.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/peter_thiel_zero_to_one_book.pdfIn PDF document text
    • https://takewinedol.weebly.com/uploads/1/3/4/7/134768260/6006157.pdfIn PDF document text
    • http://ladiluvame.mypressonline.com/wupifusopevano.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/GhiBijI/spacedraw_user_manual.pdfIn PDF document text
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/menisarifujebix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wowutuzineko.myartsonline.com/91938836490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efdd4fda-e862-41e4-b669-e882a044c8d4/terogabepagev.pdfIn PDF document text
    • http://wesatume.atwebpages.com/bobbsey_twins.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/epson_p800_roll_media_adapter.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/qu_significa_soar_que_se_te_caen_dientes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bf4e5f-7be0-4c45-bde0-d8bd181b097d/why_would_a_grandfather_clock_stop_chiming.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/where_can_i_buy_cheap_ribbon.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/16402419649.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/nutrition_dunkin_donuts_glazed_donut.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 5372 bytes
SHA-256: f353d68f4aeea98f6d9c535a57e77ed1e506f0b20f1069e03dbe9c77caa0becf
font_01_sfnt_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 2516 bytes
SHA-256: 1a7cbfad342768b557dbb758362f296cdc0200bef4c7c0664b5fe63dc491d4f4
font_02_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 11640 bytes
SHA-256: 36ff7fe60af242365c1c3dcd8af3f2ffe6d4d0813b86b14361a500236dca1193
font_03_sfnt_off00012a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4A 16344 bytes
SHA-256: 7e0863d6dcdfe3ce59f67395a06e5e8634226e44f713773c85e494ff6d119ee1