Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f80746dde677c0…

MALICIOUS

PDF

84.6 KB Created: 2021-03-06 11:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: de3ce9d43433c8090363354a8843dbcd SHA-1: 8539e12476d8bbccb17af465c4cea126a9048796 SHA-256: 72f80746dde677c02abeb07f01dc1cd4cc2f0393a05cff95391ac45dc3eebfb4
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 pointing to disposable domains, suggesting a link farm designed to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://zajinet.ru/award?keyword=sims+4+new+update+patch+notes PDF link annotation
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/mopixolufivow.pdfIn PDF document text
    • http://neriloj.iblogger.org/peavey_vypyr_vip_2_40_watt.pdfIn PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/602d0b73fca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5ff0315fe3d6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369764/normal_5fc9b4d496bcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491157/normal_6026e2e1bd861.pdfIn PDF document text
    • https://tajewarupimef.weebly.com/uploads/1/3/2/6/132681391/pufopafoxap_zomojovug_jagex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_6013aea6288e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384644/normal_5ffa6ba7a17f2.pdfIn PDF document text
    • https://nitogumijuta.weebly.com/uploads/1/3/4/8/134876923/dasimuzedirofiv_falokam_gemuxufalavotax.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/7f5db9877dd.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://s3.amazonaws.com/jazuravazaguz/jebofebunividawubux.pdfIn PDF document text
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_45930743806f46bc9bde24423f589a33.pdf?index=trueIn PDF document text
    • http://fabovodowep.epizy.com/tekonsha_p3_brake_controller_manual.pdfIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_1925f20d40ee47fa9083f85de0ad3980.pdf?index=trueIn PDF document text
    • http://nekofixas.rf.gd/la_bambola_assassina_2019.pdfIn PDF document text
    • http://pizodixevefok.rf.gd/free_music_app_no_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/a._c._market_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/kosegipixoreda.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_d3fb122f0a3649ff935ed9418ffe2a85.pdf?index=trueIn PDF document text
    • http://kexomuradalo.rf.gd/harness_racing_form_guide.pdfIn PDF document text
    • http://pujusojup.epizy.com/buffalo_soldier_full_song.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_d87068e0534e4b9cbafa75572b96c858.pdf?index=trueIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_a7ce076e37364b419931981362c54110.pdf?index=trueIn PDF document text
    • http://gumusijejokezit.epizy.com/steam_0_bytes_s.pdfIn PDF document text
    • http://zovuzizosagedip.epizy.com/distributive_property_polynomials_worksheet.pdfIn PDF document text
    • http://futifuzofu.rf.gd/asphalt_7_heat_apk_data_mod.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_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 5352 bytes
SHA-256: 14904f8944e3f209f13a080d1ac40d771325cc9c0cb5eb250d9c45db8d7614f1
font_01_sfnt_off000112dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DC 10192 bytes
SHA-256: 23306811ba569fab59aa9994028ce05919929a022c9ec4c189c09b9a5ea5ade5
font_02_sfnt_off000135b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34