Malicious PDF — malware analysis report

Static analysis result for SHA-256 74def6f56783dd54…

MALICIOUS

PDF

90.5 KB Created: 2021-03-17 08:01:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1300931fe5688f6adfb776573456d2b2 SHA-1: 628fcb344aa0a7d994bf95cbec9f89ba5e7cec72 SHA-256: 74def6f56783dd545a8a5157831798a6e056514d3389f99be90f89bdfab4954b
186 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 on disposable domains, suggesting a link farm intended to drive traffic or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/123?utm_term=sheet+music+for+havana+piano PDF link annotation
    • http://devlp.design/menegoberuxilakamemofexayrlk0.pdfIn PDF document text
    • http://uggi-ugg.com/joseph_campbell_heros_journey_meaningjxhen.pdfIn PDF document text
    • http://tamakar.xyz/identify_slope_and_y_intercept_worksheetr4w46.pdfIn PDF document text
    • http://premiumpornclips.com/kalomuketedavasuzazasisozsitoj.pdfIn PDF document text
    • http://uanews.website/voxoginovubi5utup.pdfIn PDF document text
    • http://buvofigutunam.22web.org/woodmansterne_primary_school_ofsted_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4fa818a-12c3-4d2d-a1cd-deab22f3c7bb/ladabaximasamaxaxi.pdfIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_1abb4d3af340499abf7462c7c3174f66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a474b0e-b181-4a8e-ad1d-c4306e6d285b/95186510629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6c3c55-70ed-4604-9a38-9ea69e00a1ec/is_forex_worth_it_2020_reddit.pdfIn PDF document text
    • http://nijugatujoz.rf.gd/rise_of_nations_android_port.pdfIn PDF document text
    • http://setowejow.epizy.com/74250367635.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_c67e62226a604c23a350a66689bc3c83.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b1150a4-65a2-4b07-bc3a-01dc3ab69e7c/limiputovemud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a643c0-2665-4bb8-9bf2-45b0f52143c8/xesuzowidudul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a44575c-4c79-4c04-8012-b73be1a74347/network_security_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35a9651-1ead-4235-9548-780651b3b48c/best_tutorial_for_python_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6011026e-4056-4e81-8b6c-d41cd0f8ec34/tuesdays_with_morrie_aphorisms.pdfIn PDF document text
    • https://6090ae5c-070c-4b50-bfd2-11a66789f099.filesusr.com/ugd/83cce3_80972197441940cc8153ecf1fc9ff7af.pdf?index=trueIn PDF document text
    • http://kesugonapopuw.epizy.com/how_do_i_file_a_usps_insurance_claim.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E01 5384 bytes
SHA-256: 33eeb9352c8332c85ab1d189ee0e041116abc2ed219cdfb584b0f1397594fd87
font_01_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 11736 bytes
SHA-256: 99cc6ff1554ae3532db978147194b45da2391e376f0c55eb30ea968a8b42d720
font_02_sfnt_off000147aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AA 16100 bytes
SHA-256: 9cfb948b915a4694feeb7f8719f2b65905b0a58e2ed918074a610570d07e7249