Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d112f57ca9c0b0…

MALICIOUS

PDF

72.0 KB Created: 2021-04-02 22:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3aa9dcb51abf3ab13cf53189629b1465 SHA-1: b440dbdbd35fe6ad983713c755e1da18118ffed1 SHA-256: a9d112f57ca9c0b09327d27529a608dbb2d36f8aa92bbf5520b3d06525c2ec44
156 Risk Score

Malware Insights

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

This PDF file, identified as malicious by ClamAV and an ML classifier, contains numerous external links, including a significant link farm. The document body, though partially corrupted, suggests a lure related to 'Articles worksheet for 6th grade'. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate a likely attempt to direct users to a network of sites, potentially for SEO manipulation or further malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=articles+worksheet+for+6th+grade PDF link annotation
    • https://cdn.sqhk.co/mikedeto/iJgengh/94858389101.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/sFjeikl/lenovo_support_warranty.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/E4Vha1Y/wuxorenavuvudod.pdfIn PDF document text
    • https://cdn.sqhk.co/rafatuvolix/aSgg5EX/48704908581.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/ggEpja3/battery_operated_candles_coupon_code.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/fm5JhYw/custom_cakes_in_memphis_tn.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/gePLKij/create_list_ruby_on_rails.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/24816086569.pdfIn PDF document text
    • https://b760d8db-9746-4821-aa2b-94c9f806d328.filesusr.com/ugd/26ce45_e551da6b674a41928b8d91f40d7d25b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gulapore/15610135332.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_5e4fd75693544bec839a22e6032881a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/st_bedes_mentone_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/septic_abortion_management.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/bomurexesejofedoreboguga.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_59063b83037d494c8cead9f4502af42c.pdf?index=trueIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_2e7bb0f2b4b54aaea913039e35fbac98.pdf?index=trueIn PDF document text
    • https://16b16ea1-1eac-4681-bfdb-39d0b7b0c60a.filesusr.com/ugd/d6b497_02c45ddae4de4df4b73e3469ec1220f5.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_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 5584 bytes
SHA-256: 018c227c02185f99513c790d83f0ae4d4e22b083ef28d9c9f9f8cb88901cda4b
font_01_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 10640 bytes
SHA-256: 07c45a056eb91c70dd4ae5773effa024c388b9e99985943a542595d9e0015adc

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