Malicious PDF — malware analysis report

Static analysis result for SHA-256 3035a72a646a46f2…

MALICIOUS

PDF

74.9 KB Created: 2021-03-11 15:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c961c9dcee2d03ee139ad7804395112 SHA-1: 27b9861b83e807ac4b9cfdaabb1e89f4dfe8e3f8 SHA-256: 3035a72a646a46f2d38c9ce11718d31d502ea88e0506f35e44809764afb7707e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs and the PDF structure are consistent with a phishing lure designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=per+capita+income+average+median+household
    • http://sale-siberian-force.online/mixanovibapa9bzkw.pdf
    • http://cancandance.org/jcpenney_sewing_machine_model_7050_partssl7wu.pdf
    • https://bixikobitil.weebly.com/uploads/1/3/4/5/134525497/ranosirawid.pdf
    • http://remont-kholodilnikov.website/xesusexisod29bx.pdf
    • https://mepotogi.weebly.com/uploads/1/3/4/7/134737672/jezaka.pdf
    • https://veminimuvaw.weebly.com/uploads/1/3/4/6/134630651/vuzukefe.pdf
    • https://gojupisot.weebly.com/uploads/1/3/4/0/134016698/konusivigobanivav.pdf
    • https://nokivuvaxeg.weebly.com/uploads/1/3/4/5/134594014/4df86caeb56e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vososasoxumete/59781432388.pdf
    • https://uploads.strikinglycdn.com/files/3a5b1c26-b6c8-4758-9003-18a2502c9122/5th_grade_math_worksheets_with_answer_key.pdf
    • https://s3.amazonaws.com/pibajuwi/human_physiology_mcq_book.pdf
    • https://uploads.strikinglycdn.com/files/ff91d3f5-32ba-4893-b60b-eb698c20cb0c/44285274754.pdf
    • https://uploads.strikinglycdn.com/files/26b53fcb-1ee1-42d5-b14c-d1a818f49f36/30117862046.pdf
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_08821b828a4a44f1b1339a360e95da4c.pdf?index=true
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_256b5bd2e1504f1b931ecfdf656c242d.pdf?index=true
    • https://s3.amazonaws.com/rerinago/courtesy_car_agreement_template_uk.pdf
    • https://s3.amazonaws.com/pojikovewijeja/hp_photosmart_d110_wont_connect_to_wireless_network.pdf
    • https://s3.amazonaws.com/kovezux/gilgamesh_a_new_english_version_stephen_mitchell.pdf
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_902c9bbcfc7b48e5abb7266ce834d5b6.pdf?index=true
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_2ee50529adc34dbe81a7f2ad0ebb2006.pdf?index=true
    • https://s3.amazonaws.com/fotepopunaj/listview_example_with_adapter_in_android.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64c.bin
28171be024cfa4ac537f1a786c44366854bd348a412f57b41ef052af56e6fa1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 5548 bytes
font_01_sfnt_off0000f904.bin
29350c4317dd65841607ec2c8698f85cf758d11a643344bda00b7c445c56faf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 10780 bytes

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