Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0357433521662b…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 23:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2543bf10473bb7cefd0da9c17ace3f37 SHA-1: cbbfb245f4cba59b20e6ea5b8f5b759f3fb4de9b SHA-256: ab0357433521662b691b07389ce136de24730d50731298cbd5afa80bb45be036
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be related to printer issues, likely a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/strik?utm_term=hp+officejet+4622+will+not+print PDF link annotation
    • http://fuxutigox.mypressonline.com/25008358857.pdfIn PDF document text
    • http://begimewabifax.getenjoyment.net/rukitigoposixejijotuwak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_604027e32bf91.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/Ffhibha/air_war_games_for_pc.pdfIn PDF document text
    • https://debimagobu.weebly.com/uploads/1/3/1/6/131637583/83b8c.pdfIn PDF document text
    • https://cdn.sqhk.co/gukomoluda/jejihid/wojenanuwaxulave.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/bjcgcie/move_apps_to_sd_card_samsung_a21.pdfIn PDF document text
    • https://sijetiwiriwex.weebly.com/uploads/1/3/2/6/132683168/fusuzipuzexak-jogugaxukus-nisanax.pdfIn PDF document text
    • https://jejademi.weebly.com/uploads/1/3/4/2/134266227/9187552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_6062be091c356.pdfIn PDF document text
    • https://tulofezufiruz.weebly.com/uploads/1/3/1/4/131409090/1565550.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/Rnlheid/run_run_super_v_apk.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/abandono_animal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444100/normal_5fcc8eb1dc2e6.pdfIn PDF document text
    • https://filigewu.weebly.com/uploads/1/3/0/7/130738657/9678286.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a79c6309-487e-499f-a993-0ac454a400c8.filesusr.com/ugd/747acf_948150d4b07f437d9f690b005a678bdb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0533f93c-408f-42a2-8786-01f46e64151a/what_does_flo_mean_on_a_black_and_decker_battery_charger.pdfIn PDF document text
    • https://b7c0b8aa-2746-4b81-86ab-4dfcec723e12.filesusr.com/ugd/383078_8d85619b08f449178e68f8b0e35acc99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d210b6cf-6475-4bf7-947f-22dcf90f67be/macbeth_act_3_reading_comprehension_questions.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_988da3e115cd4b44a51d92aec6d3b4eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce8e68cb-a939-4436-a7c6-25131011ca1a/does_target_have_sodastream_refills.pdfIn PDF document text
    • http://wazeniwemir.onlinewebshop.net/dekabonumepo.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_b98d26c053e146308406778834549af6.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_edd75d1bdaa44649a52be132999e3756.pdf?index=trueIn 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_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 5124 bytes
SHA-256: 919b7b3555f1a3a10482c3e6f9792250b884a2434c02a8e60abcfaefb4d2ffd2
font_01_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 11176 bytes
SHA-256: e8f00568515b4d29c080af511fb690d53f7727d884ed25b74622390f342f1751

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