Malicious PDF — malware analysis report

Static analysis result for SHA-256 a773e1fbe6a71956…

MALICIOUS

PDF

82.0 KB Created: 2021-04-06 02:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 376615c89b4310415f1c8676265c5e6e SHA-1: 29ec200f61b98e8b36ba9238c69ecd11096ae0d7 SHA-256: a773e1fbe6a71956a83b20fa7f89c5fd4f476900f91b8445d94d21f0182138f8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. The primary URL, 'https://xezojetit.ru/award?keyword=blender+2.+79+shortcuts+pdf+download', suggests a phishing or malicious redirection attempt disguised as a software shortcut download. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/award?keyword=blender+2.+79+shortcuts+pdf+download
    • http://salukapebuke.iblogger.org/holistic_approach_in_social_work.pdf
    • https://cdn-cms.f-static.net/uploads/4450639/normal_600e4600b9550.pdf
    • https://wapexuji.weebly.com/uploads/1/3/5/3/135329723/sibobimu_bosezu_vulafovi_risafozeliruxop.pdf
    • https://cdn-cms.f-static.net/uploads/4454306/normal_6061175901cec.pdf
    • https://cdn-cms.f-static.net/uploads/4454561/normal_5fe828e013b09.pdf
    • https://vebeviwikime.weebly.com/uploads/1/3/4/3/134317270/8521322.pdf
    • https://kawutakupilim.weebly.com/uploads/1/3/4/2/134236314/jonabage.pdf
    • https://cdn-cms.f-static.net/uploads/4402711/normal_606355b03c725.pdf
    • https://xerazagas.weebly.com/uploads/1/3/0/8/130813913/pijidufubog-rividebutedi-sabuzul.pdf
    • https://cdn-cms.f-static.net/uploads/4460461/normal_603c4a86b86c6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a0feaf19-9637-4260-afa5-ebc979505657/cuisinart_dbm-8_burr_grinder.pdf
    • http://nuxewetim.rf.gd/54538609660.pdf
    • https://s3.amazonaws.com/muxozuvalubi/how_many_names_in_vishnu_sahasranamam.pdf
    • http://padubarejibuso.rf.gd/93012892562.pdf
    • https://uploads.strikinglycdn.com/files/33c120c6-3dca-435e-a72a-2040d431e53d/dadolar.pdf
    • https://uploads.strikinglycdn.com/files/29ea51c0-c714-47a2-a9eb-134a58a2eb4a/text_guru_reviews.pdf
    • https://uploads.strikinglycdn.com/files/db6b8804-17b6-4700-bf02-f6c38cf4c2ba/silafedorapa.pdf
    • https://s3.amazonaws.com/pusolefosex/how_to_use_homemade_projector.pdf
    • https://s3.amazonaws.com/fizufapu/27022911909.pdf
    • https://s3.amazonaws.com/wovedukevikov/toporiwofaxewimesepuduf.pdf
    • https://s3.amazonaws.com/rorives/how_to_check_my_vocabulary.pdf
    • http://pewafinapotoja.rf.gd/lalubosu.pdf
    • https://s3.amazonaws.com/pujirageg/sony_ht-ct260h_sound_bar.pdf
    • https://s3.amazonaws.com/viboxikuz/malorozejodezu.pdf
    • https://s3.amazonaws.com/xilasisefi/22770951811.pdf
    • https://s3.amazonaws.com/tapelu/modekegewexidixub.pdf
    • http://niwirafe.rf.gd/aircraft_structure_textbook.pdf
    • https://uploads.strikinglycdn.com/files/d4a12625-4887-4599-8909-db60409810e7/47950443082.pdf
    • https://s3.amazonaws.com/pewebopufupe/8096469004.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe56.bin
c85c851fc47eed12411aa2dd0d73765bdbdd4e7a7aaa822bb8885d2cb476a2d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 5784 bytes
font_01_sfnt_off00011221.bin
18f2e9c9823e409966f8000259d276c68c2e7af890a62083d45dacff8f12dc94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 11916 bytes

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