Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbb90f2cb20dca1…

MALICIOUS

PDF

104.0 KB Created: 2021-04-09 09:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3b41316616ca81d854a21c9018709b65 SHA-1: f29d89ca0b2881c6f4eb381fc282f576d4e593ef SHA-256: 8bbb90f2cb20dca18a13e7f78f9ecff5958bcf5a7c09364b544234db7904a796
134 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external URIs, some pointing to disposable hosting and link farms, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains embedded URLs that likely lead to malicious content, potentially exploiting the user's urgency as indicated by a heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=mr.+coffee+3+quart+iced+tea+maker+tm3+%2528yellow%2529 PDF link annotation
    • https://cdn.sqhk.co/figakeves/GrGRifT/gladiator_rising_roguelike_rpg_mod_apk.pdfIn PDF document text
    • https://gemumumesuligiv.weebly.com/uploads/1/3/4/3/134318519/62bc8a3264625e4.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/4gf1Whi/jomifafelepomine.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/dipovev.pdfIn PDF document text
    • http://penageli.getenjoyment.net/dalife.pdfIn PDF document text
    • http://bamupiwabibajew.mywebcommunity.org/mixed_strategy_nash_equilibrium_3x3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414866/normal_6037a6ed8ef58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5fe9a8cea1d8d.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/how_to_use_algebra_tiles.pdfIn PDF document text
    • http://wivupivipewezap.mygamesonline.org/accounting_concepts_in_marathi.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/farmacos_anticoagulantes_clasificacion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403131/normal_602bb1f5117cf.pdfIn PDF document text
    • https://lonofajizol.weebly.com/uploads/1/3/5/3/135389348/tepidafokesak.pdfIn PDF document text
    • http://rixadixiji.scienceontheweb.net/bipos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393488/normal_5fde4c3137ce7.pdfIn PDF document text
    • http://kovafuwir.getenjoyment.net/68250196187.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/LFWmThc/nogagavamifuwekoxakufep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/what_are_the_seven_rivers_in_africa.pdfIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_ad1e9f0d36964a2eba1ee5711fbda92b.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_b0ba46e1a45d49c1833d22ad184f76b6.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off00013492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 2828 bytes
SHA-256: f1383d7cd59a6739427f7596f1165603adacbacc8f657d4e156367611f565abb
font_02_sfnt_off00013e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9B 5728 bytes
SHA-256: 0e86ae4079beedd1b4e26790ac34b6a5e4d73a8a22aa27cd920fae509a47f3c3
font_03_sfnt_off00015249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15249 12668 bytes
SHA-256: 41955a83b668fe9081bff7accefc8d4a015c7daf8e0c668200331446a16ef031
font_04_sfnt_off00017cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CF0 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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