Malicious PDF — malware analysis report

Static analysis result for SHA-256 9116f1407527858d…

MALICIOUS

PDF

83.5 KB Created: 2021-05-31 17:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: eb52da1d53ea053b2a25c84471e1f5e9 SHA-1: 9ca0beb499bdf5a0cc71f782dd252a347f70cc14 SHA-256: 9116f1407527858d4a421fb8c7b3323f3f3a4fece320bbf08635fe1802ee1cef
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of external URI heuristics and the 'link farm' detection further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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 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://medvor.ru/pbw?utm_term=the+wife%2527s+lament+old+english+translation PDF link annotation
    • https://tizirabavapamob.weebly.com/uploads/1/3/1/4/131453045/mitate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421468/normal_603c3a9f16181.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/624261378d4ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_604e530b8904f.pdfIn PDF document text
    • https://dosevabif.weebly.com/uploads/1/3/1/6/131637409/goxobu.pdfIn PDF document text
    • https://kalabuzamebuku.weebly.com/uploads/1/3/4/3/134339718/93ebb22f7.pdfIn PDF document text
    • https://pozojemiveze.weebly.com/uploads/1/3/4/6/134690114/sadekuwa_jekej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_6015640965584.pdfIn PDF document text
    • https://binewetakug.weebly.com/uploads/1/3/5/3/135326509/janunutud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491945/normal_6013723415951.pdfIn PDF document text
    • https://litefobobufi.weebly.com/uploads/1/3/5/3/135326689/6411330.pdfIn PDF document text
    • https://pabarubuvu.weebly.com/uploads/1/3/1/3/131379718/nevifanitogazufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451033/normal_5fed4b760a120.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
    • http://kolasotosexu.pbworks.com/f/the_tenth_insight_audiobook.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/bandiere_del_mondo.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144412167/how_to_connect_ue_boom_to_new_phone.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/zunomi.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/how_to_start_keto_diet_for_free.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/clicker_heroes_import_code_editor.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144414048/negowujuxuxenarapageveza.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/true_skate_all_maps_apk_2018.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144412536/vamupaxodoxedigexor.pdfIn PDF document text
    • http://lipadune.pbworks.com/w/file/fetch/144414207/rofosibakiwejojidopuwa.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/kalimas_in_roman_english.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144416160/73574146546.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144415272/vepekemojodalegixoke.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144411645/how_to_connect_vizio_wireless_sound_bar.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_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 5184 bytes
SHA-256: edbdb66c6a9747bcf42b7cc716495f5decaabc703f24152f97073e0dbcfba8c6
font_01_sfnt_off00010954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 12456 bytes
SHA-256: a628861dc0d28ab190bf66d88153ceeae05b12576a40f87936404114d760884d
font_02_sfnt_off0001303d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176