Malicious PDF — malware analysis report

Static analysis result for SHA-256 a884af88c4581e1f…

MALICIOUS

PDF

95.4 KB Created: 2021-03-23 14:09:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71eb9c8f2f17c7f7adef5b310c4259ec SHA-1: 56e81687ac39f9c24ab31f9127bb7db877437809 SHA-256: a884af88c4581e1f83fef28064294a52f20fe990de932c0875573be792927365
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on dynamic DNS services or free hosting platforms, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'foundations in american history answer key', aiming to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nipisod.ru/wix?keyword=foundations+in+american+history+answer+key
    • https://wavafawiwex.weebly.com/uploads/1/3/2/8/132815000/b74f8ac35.pdf
    • https://lobududovidaxu.weebly.com/uploads/1/3/3/9/133997350/5998048.pdf
    • http://padojobimo.mywebcommunity.org/45574283624.pdf
    • https://wiwazojuxosupud.weebly.com/uploads/1/3/1/3/131379189/sejaxamazifoni.pdf
    • https://cdn.sqhk.co/fetumamuv/hdbifgh/9021546982.pdf
    • http://xagakojitogiva.getenjoyment.net/mapa_metro_mexico.pdf
    • http://lidzadva.xyz/gleeds_financial_reportbs47f.pdf
    • https://cdn.sqhk.co/ruselaguzoda/gfigejh/xbox_game_pass_beta_pc.pdf
    • https://vizufawamowimo.weebly.com/uploads/1/3/4/7/134700475/612f5b01a90376.pdf
    • http://ziratonis.iblogger.org/22236137990.pdf
    • https://cdn.sqhk.co/gitovera/fyy12Eo/word_wars_cheat_app.pdf
    • https://gawuwusirijer.weebly.com/uploads/1/3/4/1/134108670/694ba07a1.pdf
    • http://apeech.ru/caloric_gas_range_knobs6uv1k.pdf
    • http://fafikup.scienceontheweb.net/cat_s_cradle_kurt_vonnegut_download.pdf
    • http://beamorem.com/965847076586jlrf.pdf
    • https://tikedamo.weebly.com/uploads/1/3/1/4/131453682/tepugunaxulasulex.pdf
    • https://bokawagorulok.weebly.com/uploads/1/3/4/2/134234603/nesafi_muwamani_xamavexe.pdf
    • http://dafinopinodejo.22web.org/bowoxuzavufifoga.pdf
    • https://dupuzebor.weebly.com/uploads/1/3/4/6/134639309/vusinuneguk.pdf
    • http://pebonemariv.mypressonline.com/how_to_eat_fried_worms_movie_rating.pdf
    • http://justiciaforjustice.com/52933087522mh8d9.pdf
    • https://cdn.sqhk.co/tovipovo/hbTEjay/personal_panic_alarm_keychain.pdf
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/kezokimol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://perexuwofogefo.onlinewebshop.net/igloo_model_ice102c-silver_manual.pdf
    • http://vogafaxusa.epizy.com/46969723003.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001376c.bin
8dd4cbf7e204a395fc33c933435e1d9833bcf9e7d3a78b1393243572f974e337		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1376C 23304 bytes
font_00_sfnt_off0000ffc2.bin
aa064ddf54256ceb2a1350d0e4112968f5ccdaad634ca2d55c2df853b3b19cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC2 5240 bytes
font_01_sfnt_off0001117d.bin
a25f0006088d91248614fe5c093dcc474253f412a0c455a3e0b24a00c463a316		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 11036 bytes
font_03_sfnt_off00016072.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16072 4324 bytes

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