Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b84dd6164eb7eb4…

MALICIOUS

PDF

77.2 KB Created: 2021-04-16 16:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90e8ec2eca3f654db96e81881f2480de SHA-1: c1238f8cf4b53aed7ad0246c589dd84fbded53de SHA-256: 5b84dd6164eb7eb4eb36b8a67823ac69e174b1a5ba28d0f4f47c58fc7dea6c73
186 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. 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.
  • 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://bologen.ru/strik?utm_term=kitchenaid+superba+double+oven+control+panel PDF link annotation
    • https://cdn.sqhk.co/dusaradezat/TtojisU/diy_pleated_face_mask_pattern.pdfIn PDF document text
    • https://pagurewitapusak.weebly.com/uploads/1/3/4/6/134632053/nujuxowegi_mabuviborazuj_simisaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/remokuvupen/gAjghb9/my_bitcoin_wallet_address_change.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/hcRjf7B/45025808997.pdfIn PDF document text
    • http://itdiscount.info/702763015503vks5.pdfIn PDF document text
    • https://pinowutofabu.weebly.com/uploads/1/3/4/7/134763632/48542143.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/0DSvgi4/ten_pin_bowling_ballito_junction.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/5408556.pdfIn PDF document text
    • https://cdn.sqhk.co/wanolugago/gjhdWF1/can_you_escape_the_room_iv_level_37.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/iOjbjgo/59151351256.pdfIn PDF document text
    • http://tehnikator.ru/acurite_14.5_timex_set_and_forget_wall_clockrrl4g.pdfIn PDF document text
    • http://pesuloduf.medianewsonline.com/gram_negative_bacteria_and_gram_positive_bacteria.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/foljbGE/wupilexowasijuxo.pdfIn PDF document text
    • https://vopukuno.weebly.com/uploads/1/3/1/3/131383764/belilafuwafetenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://weparaxopulo.atwebpages.com/tawatifesunerezit.pdfIn PDF document text
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_d4c3d720e6bd485caa03733489c09e98.pdf?index=trueIn PDF document text
    • http://zeroxezubanalil.onlinewebshop.net/linux_shell_scripting_tutorial_download.pdfIn PDF document text
    • http://fufuzadawefor.onlinewebshop.net/pebajoj.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_8562c32ee4af475b8879cb698fc9ff7f.pdf?index=trueIn PDF document text
    • http://jimarol.myartsonline.com/2015_mazda_3_owners_manual.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_938f446b2edd4244819d46456998e0b7.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_2959240f7d494b5cb32dd2aa73a203a3.pdf?index=trueIn 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_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 5332 bytes
SHA-256: 3cb4ec101a32927437a55d5f69daa6085bc2f4c0344971f590ebc4669b7cbbdc
font_01_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 12568 bytes
SHA-256: aba79c0dc487f962cb2daa8f8c2beb52dba943922ba596adeec16640a7c322e2