Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b1563fa0a2edf2…

MALICIOUS

PDF

76.7 KB Created: 2021-03-20 04:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b6a6c75500acf7f9abc28b299e79cea3 SHA-1: cd09800e4b9072f1ba8d52ecf1ba3e332640380d SHA-256: f3b1563fa0a2edf2a3285746480c057766d3c48f30db11281899fae2bf4059fe
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external links, including a suspicious URL on 'dugedepap.ru', suggesting a phishing or SEO manipulation attempt. Although no scripts were extracted, the presence of many external links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/wix?keyword=lowrider+rims+for+sale+in+california PDF link annotation
    • https://cdn.sqhk.co/morureju/cMjijic/marvel_runaways_nico_powers.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/ugggihj/bluffton_university_baseball_division.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoveted/cjeMjEx/aambala_movie_video_songs_720p_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450733/normal_605546007b431.pdfIn PDF document text
    • https://cdn.sqhk.co/kerikone/ieshhe6/xodujubazolawelenowomowif.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/jafonexofevimap-betazi-loron.pdfIn PDF document text
    • https://kabosasano.weebly.com/uploads/1/3/5/3/135398154/9595348.pdfIn PDF document text
    • https://cdn.sqhk.co/rogevuzazi/hi7gijh/84373909002.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_6000439b9481b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464732/normal_5fe269001a1ab.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/BF0Gjbe/zombie_harvest_apk_android_oyun_club.pdfIn PDF document text
    • https://sugodaxekot.weebly.com/uploads/1/3/1/8/131872070/wunuresuradabo_vaseba_tojesadudiliro_xikukotaketasut.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/heifijJ/36592937876.pdfIn PDF document text
    • https://mifopezuzata.weebly.com/uploads/1/3/4/4/134484464/ccb11.pdfIn PDF document text
    • https://sukanogijero.weebly.com/uploads/1/3/4/3/134333185/8540397.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/2922794e-653c-4eba-bd56-02af2e1fff96/skywalker_trampolines_dual_accessory_kit.pdfIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_faa9860af6424ec9baacac774494b5a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/959bda68-4500-4168-9793-3b8c97a7f83a/26729831011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae18fbf-dd2e-4464-94c2-bbf46e8760d0/45601917048.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_f17953e049ba4fb99b96d9a790cd5095.pdf?index=trueIn PDF document text
    • https://3558f7ac-3b82-44cc-970b-b3f11879385a.filesusr.com/ugd/2e16aa_eba777878bfc4b4a93447e97d4a8b452.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29af6df4-da34-4336-86d9-228c46b2a119/12105653329.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_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 5200 bytes
SHA-256: 02d636884527525e7efef22fe723040fb3032b6e2a23ab8164eb0691ae77b0c1
font_01_sfnt_off0000ff28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 11048 bytes
SHA-256: e6a275312deb08e2ec34d6c4f3d1dbc2fcbee3c914a939b907de9618436784a8