Malicious PDF — malware analysis report

Static analysis result for SHA-256 0493308f310d7e7a…

MALICIOUS

PDF

52.0 KB Created: 2020-11-04 14:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 80521ba0b4d5d5aadca04ec20ddabed8 SHA-1: bf326f2bfe2e69994dec5c947383d9c7649721e2 SHA-256: 0493308f310d7e7a7f52e1610905766f94e9fc6c7515d7277d43ab4aea0b50a2
194 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are identified as redirectors to malicious infrastructure. The heuristic firings indicate the document is designed as a link farm, likely to distribute malware or conduct phishing. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ggtraff.ru/aws?keyword=jun+hyun+kim In PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/9324891.pdfIn PDF document text
    • https://tupipukevoluda.weebly.com/uploads/1/3/4/0/134041298/gidixalalutil_sijusoxu_terifiruliviru.pdfIn PDF document text
    • https://kexazupaxi.weebly.com/uploads/1/3/3/9/133997339/nutagozax.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/d0a69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f9d658f8df63.pdfIn PDF document text
    • https://kiwusaxanasatip.weebly.com/uploads/1/3/0/7/130738973/ad5cbc097343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_5f9f2cbdb8a8b.pdfIn PDF document text
    • https://jidamusalaf.weebly.com/uploads/1/3/4/3/134378250/zixevuwusam_mevonu_jujaxiba_rurujofisazokud.pdfIn PDF document text
    • https://jiwanozote.weebly.com/uploads/1/3/4/3/134354006/woderubizima_fisuzojowisemu_biwezovimuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zirojopemup/ruwaxexawazokigesokiji.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/loaded_question_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/an_introduction_to_the_sociology_of_health_and_illness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6c975b-9cf5-433b-8585-7b54906df141/lewuwosururemeruwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ab364e8-a5b5-43b1-9d81-bee1b0b86675/comentarios_del_colegio_liceo_segovi.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/cause_and_effect_worksheets_grade_3.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7508 3836 bytes
SHA-256: 628276ff271ec555923cb5618a874bb6fca2282f6bb864aa3fcdfc19154b11e1
font_01_sfnt_off000082b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82B6 4140 bytes
SHA-256: 8d1fcb0c4ca25de2707295daa8749b4e96e71ae98d628e1033984bf380034ecd
font_02_sfnt_off00009076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9076 10868 bytes
SHA-256: 37cb923cc173a7140be76f91b246ca32f297fd277dca95a04f87fc453f8908de
font_03_sfnt_off0000b52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176