Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f629021c9addec9…

MALICIOUS

PDF

81.7 KB Created: 2021-03-19 14:24:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e81672a71b1e3cfb24946b12c92e7625 SHA-1: 734b298b5406f67dfac42cc16e25e437d4fcbece SHA-256: 7f629021c9addec992277bf78eba074a76d52f99020841b33c5121198af03567
246 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. It uses brand-impersonation credential phishing. 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 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rutokiwudobuvu.weebly.com/uploads/1/3/4/6/134686771/bijego-wikafukisu-rizufera-zadujut.pdf.
  • 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://jumiwimov.ru/wix?keyword=rational+numbers+answers PDF link annotation
    • http://world-wild-shop.com/how_to_use_plantronics_headset_c054oo33k.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/hgWFYib/38490044364.pdfIn PDF document text
    • https://rutokiwudobuvu.weebly.com/uploads/1/3/4/6/134686771/bijego-wikafukisu-rizufera-zadujut.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/icrihgf/industrial_factory_stool.pdfIn PDF document text
    • https://luwiritogejoti.weebly.com/uploads/1/3/4/2/134266422/b9048af6.pdfIn PDF document text
    • https://telidububiz.weebly.com/uploads/1/3/1/4/131452987/suxipatijinujaxe.pdfIn PDF document text
    • http://on-arenas.com/naxigexepumuloxuvadazexx2rf.pdfIn PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/masiv.pdfIn PDF document text
    • https://femixazate.weebly.com/uploads/1/3/4/3/134363246/6473549.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/hijbkih/clash_of_clans_hack_pc_online.pdfIn PDF document text
    • https://cdn.sqhk.co/gawivoxolo/8ohdAr6/3001721249.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85561fb-05d6-46d2-b20c-5bbc69a1e972/diff_b_w_promissory_note_and_bill_of_exchange.pdfIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_c255ea5ca8b541039029fad8513467a5.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_791ec9a6f4d24f2f9cc0e9aca7441ec9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1b6e30-f2d4-4458-90ed-8ee875b9c811/57743204103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e9d358-54b5-44ef-a398-530215ae6337/vitafabemirevegatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/907ddec5-8778-4897-ba3a-0ecf07a389b5/javadob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b203ffc-8bc4-4670-9e19-5530e931265e/genak.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_a0d99b3a849e43199b2c833cc381ef10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e6f4de8-bcd5-4aae-8d4f-49577058ee0c/2014_harley_davidson_touring_models_service_repair_shop_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e0e4d6-0187-47b4-aac8-0ebf47f7e7fb/best_red_light_therapy_on_the_market.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_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 5068 bytes
SHA-256: fff70a6a3683e3370eb40dd316c5d6f7892eb8f4c89d6c25bb0f58cc1364ac37
font_01_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 11180 bytes
SHA-256: 7f05fa07a90c4a4ed6fc79efe68107409064edbf52fd9abd3b9e22ca63a12902
font_02_sfnt_off000123a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 16276 bytes
SHA-256: 0cba91f6305fcc6d1193425df2dd3a5744842a3c8cc911706afde86bcac7876a