Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a070eec8b0ef3b8…

MALICIOUS

PDF

74.8 KB Created: 2021-03-20 18:09:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 719cf2884c686ac0a38eb69e47fcbe67 SHA-1: 555cdb2c30119e63adbad750eac39aa01a607cd3 SHA-256: 3a070eec8b0ef3b80b5becc46d49370be77e99c8d6670de0005b11a1f513d2f5
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 0.9999

Heuristics 6

  • 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.
  • 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/strik?utm_term=free+reliability+centered+maintenance+software PDF link annotation
    • https://betisifi.weebly.com/uploads/1/3/1/4/131438474/betozijirajasegar.pdfIn PDF document text
    • https://xexewevifiwewol.weebly.com/uploads/1/3/6/0/136054804/d893174c.pdfIn PDF document text
    • https://wudowured.weebly.com/uploads/1/3/0/8/130873715/xevele.pdfIn PDF document text
    • http://onsideball.info/oxford_english_grammar_book_free_download_ebookwp2je.pdfIn PDF document text
    • https://poxesaxe.weebly.com/uploads/1/3/0/7/130738711/gubamiled.pdfIn PDF document text
    • https://zulitaxovali.weebly.com/uploads/1/3/5/3/135351491/dde90eabcd7932.pdfIn PDF document text
    • https://mawafusujomadil.weebly.com/uploads/1/3/5/3/135351104/6438323.pdfIn PDF document text
    • https://velotukuzikud.weebly.com/uploads/1/3/4/7/134722024/wotududikuribi.pdfIn PDF document text
    • http://furniture21.online/twisted_metal_ps58wh8h.pdfIn PDF document text
    • http://igcopyrightverify.com/462372120400by5k.pdfIn PDF document text
    • https://gukufevekexuse.weebly.com/uploads/1/3/5/3/135305262/boxezep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_81cbed6563be4251be08b601d0a22e24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd89932-da2e-4abe-8de5-4043e89ba55d/alphatrak_2_test_strips_petsmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4879180e-64ee-4799-aeab-35e7a7eb6b48/garmin_approach_g62.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aacb24c-442d-451c-824a-bdb42938d353/sat_exam_november_2017_answers.pdfIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_261ad91bebb54d09ae14f50614f4799e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb86633-7c06-4360-9cc5-813663e609c1/ms_excel_assignments_for_students.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_e13e3f093ae1402ca7741942c7d097a0.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_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 5456 bytes
SHA-256: 57a94aa4c4160e56dfd301fb9029efd7f1e1270bad89142ff4d598e62a319b0d
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10000 bytes
SHA-256: 745b9f32bf9b7b7a65dd2bf7014393b0600797ab8da9ef84d826e7d39a871a68

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