Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f129abb1c83571…

MALICIOUS

PDF

79.2 KB Created: 2021-05-23 06:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2540d6bee1b867e59365af4167e95184 SHA-1: ad910e773cb0e57f32ea02333961a04e1a89cbd1 SHA-256: 54f129abb1c83571e6fc83de76e0ac4d12d531c8a39c98e85217d6cb74fe29cd
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 are to PDF files, suggesting a link farm or SEO poisoning attempt. The primary malicious URL identified is 'https://pelibifir.ru/strik?utm_term=import+chart+of+accounts+from+excel+to+quickbooks+online', which is likely used to host a phishing page or download a second-stage payload. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=import+chart+of+accounts+from+excel+to+quickbooks+online PDF link annotation
    • https://timonuwek.weebly.com/uploads/1/3/4/3/134383578/bitexuxibi.pdfIn PDF document text
    • https://gonibokufelari.weebly.com/uploads/1/3/5/3/135346176/nugop-nilosukowigede-duxufosawata-ribimuwopolato.pdfIn PDF document text
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/xesudowefalurin.pdfIn PDF document text
    • https://xitolomeka.weebly.com/uploads/1/3/4/0/134012462/5649513.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392658/normal_5fe2d0fbc1198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_606acb879f730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414352/normal_606463973d5b5.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/remuv/65485345565.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/34463390268.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/why_did_dead_like_me_get_canceled.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/what_is_a_false_memory_syndrome_in_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/804b748e-4a61-47a4-a352-6974e1d36852/fresh_off_the_boat_netflix_us.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ac815f-6769-496c-8c9e-4b1c5c598449/nutewutemul.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/asus_ax1800_dual_band_wireless_and_ethernet_router_black_rt-ac66u_b1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cd8f8b8-1286-4902-9184-08dd9ba7e553/vivint_thermostat_low_battery_indicator.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/5711608494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12d2f5c6-9c80-40d3-a677-9002c6218d6f/29112243537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe505cb-031b-4df5-b39c-1ac4b19ade4b/dell_optiplex_760_network_drivers_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d59bcaf1-14fb-47a1-848b-3ff245d3644b/greek_dogs_names_female.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a767b0-2720-4c6b-91c1-2fa198dbe3aa/bissell_compact_vacuum_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/syarat_space_maintainer.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_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 5588 bytes
SHA-256: 2ded51f1b8e050485d1d62667252e90355dbb605607bb0dec63ecf6f44422713
font_01_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 10508 bytes
SHA-256: af388dc5fdbf54e106678eabcefe4fab34f3cf6e6075839a0e403771e603897d

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