Malicious PDF — malware analysis report

Static analysis result for SHA-256 75aa9aaf6f99d5f2…

MALICIOUS

PDF

84.1 KB Created: 2021-04-23 17:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 680a8ce9fd1cfbc71988b2cd0eed630d SHA-1: 7508080e85ae66ab5a33f6c6ead4841918b6b8b8 SHA-256: 75aa9aaf6f99d5f27ce869a5a42eedee2a7934b8a115df28c49623a5e60c7f06
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though partially corrupted, contains a search query related to appliance repair, which is likely a lure to disguise the malicious intent of directing users to the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://xezojetit.ru/strik?utm_term=how+do+you+fix+a+kenmore+dishwasher+that+won%2527t+start PDF link annotation
    • http://kuvenumine.mygamesonline.org/electrical_circuit_symbols_chart.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/letaxetorokinafowedu.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/heshdie/video_conferencing_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/Mihiajc/25794697065.pdfIn PDF document text
    • http://vufiwopader.medianewsonline.com/cambridge_international_as_and_a_level_physics_coursebook_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/jYih0jf/pitevadazudofokoviku.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/hcfAhhx/monkey_jungle_coupon_2019.pdfIn PDF document text
    • http://pexarinolal.mypressonline.com/andres_caicedo_libros_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/bipadifudame/jhiauAJ/lelerajenatotazubi.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/84404120728.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/hgMgLgg/63781359492.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/gRifhiF/tuworuz.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://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_03f348654d7548cdad1561964c0a6388.pdf?index=trueIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_62afa7ffc6634e3f8a996b86a0508a6d.pdf?index=trueIn PDF document text
    • http://widepidaba.atwebpages.com/55535632014.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_b7e5a13654434087a72373a095b3cf8f.pdf?index=trueIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_b3df9b31c7994a4f937056e78f461e8b.pdf?index=trueIn PDF document text
    • http://wiloradakuno.onlinewebshop.net/maniregujo.pdfIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_e77d9cff0b6740ceb3908ca4d59f3f61.pdf?index=trueIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_c4bb987f640c4098bcfbd69c52a6009b.pdf?index=trueIn PDF document text
    • http://pekamidakoj.atwebpages.com/bluprint_magazine_philippines.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_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 5316 bytes
SHA-256: a4642adf0b6685f36463fc9f16aea8f5243f798eb353aa16ba2d4e98f56bd03d
font_01_sfnt_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 10840 bytes
SHA-256: c87a35359c92db80f554f06cabb8631e4c7908e222032143dab454890d2d7d7c
font_02_sfnt_off000132a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A1 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e