Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cc41d2c379f525…

MALICIOUS

PDF

80.7 KB Created: 2021-02-16 00:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 01d09d07f5c6fdf74e93a1e4047d011e SHA-1: d55c360d2bba7f53992f30afc93fe1bf036dd18c SHA-256: 17cc41d2c379f525e94ff23625103fedae12864aedcd0f49790a28d88313ace3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable hosting services. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the linked PDFs.

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://jacksth.ru/123?utm_term=how+many+shark+attacks+in+the+us+2019 PDF link annotation
    • https://xaxazusilu.weebly.com/uploads/1/3/4/7/134757455/bivajupew-mojigunivotiv.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/bevenekopoduviw-nobiboj-bikazarame-mezevuwupew.pdfIn PDF document text
    • https://bixoriwapavam.weebly.com/uploads/1/3/4/7/134731951/gugaruk.pdfIn PDF document text
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/7895489.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/diehhWZ/51971827048.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/iifJP4F/54836973240.pdfIn PDF document text
    • https://nutiniwe.weebly.com/uploads/1/3/4/8/134870290/zuziwevuv.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/875e2f.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/4sHQib8/bus_driver_simulator_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kiwametin/cUEmhbb/texegufubigosijugaleti.pdfIn PDF document text
    • https://cdn.sqhk.co/fujonexa/HhfvAha/42214943118.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/ihfxMQK/92144304253.pdfIn PDF document text
    • https://cdn.sqhk.co/tirazirevemu/gchbicD/sigazabemomego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kamegil.epizy.com/american_college_gastroenterology_colon_cancer_screening_guidelines.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_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 5708 bytes
SHA-256: 42054a5e06151a12b451fe1920e66c893854bccc9f836b81c046bbf003fa13c7
font_01_sfnt_off00011151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11151 10712 bytes
SHA-256: de433c17bc98d60a057aec09a9457d1b254ab4f463fdcc36e6b5c06b4980cc69

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