Malicious PDF — malware analysis report

Static analysis result for SHA-256 94af342de303859f…

MALICIOUS

PDF

118.5 KB Created: 2021-04-15 13:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 50951f98c40e8638d94682ebd526e584 SHA-1: 7e21ce8e67b14fb05d2b6c462d42397a2bd5c341 SHA-256: 94af342de303859f87766fc83f1f11e67509747597d7a8f9136315f5a131552a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document's content appears to be obfuscated or corrupted, but the presence of numerous external links suggests an attempt to direct users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/strik?utm_term=is+red+heart+yarn+made+in+china In PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/davanadesobamevato.pdfIn PDF document text
    • https://cdn.sqhk.co/vepefilome/mqViahh/tiptop_audio_circadian_rhythms_firmware.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/how_to_reference_citations_in_apafq6d9.pdfIn PDF document text
    • https://nutipofuvi.weebly.com/uploads/1/3/5/3/135310868/6572802.pdfIn PDF document text
    • http://buylettersonline.com/number_flash_cards_1-100_online4vlrq.pdfIn PDF document text
    • https://kolenogu.weebly.com/uploads/1/3/1/8/131871799/liferu.pdfIn PDF document text
    • https://jawanowek.weebly.com/uploads/1/3/4/3/134356941/526728.pdfIn PDF document text
    • https://zuwanefo.weebly.com/uploads/1/3/4/0/134040462/nimepoja.pdfIn PDF document text
    • https://gizipuvi.weebly.com/uploads/1/3/4/3/134312628/newem.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/FWeiajc/zenuvofuvazi.pdfIn PDF document text
    • http://gufutaca3.xyz/ielts_reading_answers_of_jumping_spiders9hrj9.pdfIn PDF document text
    • https://zejabunu.weebly.com/uploads/1/3/4/7/134719965/dfedfdb95b4a4b.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/kuzesetupalileg_viluze.pdfIn PDF document text
    • https://cdn.sqhk.co/tikugosedik/chaVTgc/82725242547.pdfIn PDF document text
    • https://wevozunivutuk.weebly.com/uploads/1/3/1/4/131484467/rigegobuka.pdfIn PDF document text
    • https://cdn.sqhk.co/jefokejab/iZzzZhh/kajifazowuf.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/jibhgxd/tegan.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/seriposuj/jesefefimovasijofikupu.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/javascript_alert_html_format.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/11184883630.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/64419762317.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/fobekopuxitowalujifiligug.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/bud_light_platinum_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/combo_priest_guide_hearthstone.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/why_are_the_lights_flashing_on_my_router.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000182f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182F9 2960 bytes
SHA-256: 3a99bfcc8a6322cb1f5d9dd0c76c95525b0630114fc12c53a342d41e6b6e0e01
font_01_sfnt_off00018d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D69 5188 bytes
SHA-256: cf6f8d43cd3b77088da11d77b84f6af20f5aa7b90bf2cc09e4540e7f93d4452c
font_02_sfnt_off00019ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EE8 13684 bytes
SHA-256: e927c64204a7ebf336fc56ff3f8d7b2e589a03b817351d4f1619ef1d634ba738