Malicious PDF — malware analysis report

Static analysis result for SHA-256 a425d60b35324082…

MALICIOUS

PDF

72.7 KB Created: 2021-06-03 15:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6d02ef11835fc8bb0e529627c6c8d318 SHA-1: 3d698b37bc0aa62323fad9888984392dd952ffc5 SHA-256: a425d60b35324082fbb05de9e4dfe066ae641829cd0568d233e05e16b2fa020c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://ketchas.ru/pbw?utm_term=is+a+red+face+an+early+sign+of+pregnancy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470523/normal_603cbe360af09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_5fc7cd6a75243.pdfIn PDF document text
    • https://lovevupadu.weebly.com/uploads/1/3/5/3/135328586/dugonegovuzi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465402/normal_5fefc7c100c52.pdfIn PDF document text
    • https://neruzokari.weebly.com/uploads/1/3/1/1/131164447/6804152.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/5809981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495551/normal_605efb7b0fd40.pdfIn PDF document text
    • https://raxaregos.weebly.com/uploads/1/3/4/3/134363135/f4234e.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/cedf84ee-b345-4fd5-9f08-8e076a66f0da/basic_english_grammar_in_marathi_free_download.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144413595/92862161987.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/f/79301490994.pdfIn PDF document text
    • http://gemometis.pbworks.com/f/82945891077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ee41e5-6f55-4773-a297-eb3e44073cbd/51130944746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f62254-6464-4193-99d5-9e385e5d5e38/little_house_on_the_prairie_season_3_episode_2_bunny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30b7366a-d46d-4d41-9793-491bac780e1e/90533074129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80bfe658-9c6f-4d45-80e8-99423e8183d6/20943748420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a88e7159-c041-42e8-9f2c-739171e52fae/voyager_legend_bluetooth_pairing_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd0178e-7372-443e-b1b6-21281d50dac7/intermatic_timer_motor_wg1573-5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6874c9-7f4d-4b4f-b445-cd4f46d32208/how_much_does_the_navy_pay_for_leave_days.pdfIn PDF document text
    • http://genarozep.pbworks.com/w/file/fetch/144527565/all_the_bright_places_main_message.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 5364 bytes
SHA-256: f54064decf4e183aaf09b7e2959463d27b19ddb49f6c58b2e68f27c9668f0153
font_01_sfnt_off0000f0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FB 10116 bytes
SHA-256: 4352c97de565af697e4bf7d4d44762d44fbbb61094db8e48a33243a77dfabbd4

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