Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27feb7b50f25bea…

MALICIOUS

PDF

85.0 KB Created: 2021-03-08 17:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 71fb974a3c8b995578d18b76ba0455b1 SHA-1: afa2152d7c65531b1f4300dd8ce3db2683a37479 SHA-256: a27feb7b50f25bea9be13fd1d49f69f2ce7bc6e624a1c094653a201daf0af77c
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 hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gimoguvi.ru/award?keyword=habanera+pdf+piano PDF link annotation
    • https://zakogekumepaxu.weebly.com/uploads/1/3/4/5/134598029/zasinodod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_6022a285d5b87.pdfIn PDF document text
    • https://gasibexagitusin.weebly.com/uploads/1/3/1/4/131408117/bajevolil.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/lebozefukod.pdfIn PDF document text
    • https://wuziwewaramided.weebly.com/uploads/1/3/4/3/134311070/zeveluvudilibipupi.pdfIn PDF document text
    • https://foxuginatumusex.weebly.com/uploads/1/3/0/7/130775376/fufawe-wokezamolakapof-zusimi-welamezifivex.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/jiledenozenukego.pdfIn PDF document text
    • https://voxivunesiru.weebly.com/uploads/1/3/1/4/131407918/nolutojikux_likezu.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/990718f06.pdfIn PDF document text
    • https://lepabamun.weebly.com/uploads/1/3/1/6/131636917/da99f16e9d40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411918/normal_5fc612380acea.pdfIn PDF document text
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/78aa2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_ec11200c49d54d21b1d2fd106962b502.pdf?index=trueIn PDF document text
    • http://vumamuv.myartsonline.com/bolens_21_inch_push_mower_wont_start.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_c2a95fabc431489caee9484a76ffa000.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_dfa03ca50616415aac130e7cd094438b.pdf?index=trueIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_53b3d9adfd384c889909601fb16a2259.pdf?index=trueIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/16191382950.pdfIn PDF document text
    • http://siniligavaxuvul.onlinewebshop.net/how_to_turn_off_demo_mode_on_panasonic_genius_microwave.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_eea1ab055ce34ec689ce7ed3b00a36a7.pdf?index=trueIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_df72a1c6364f4a78a87b4bbf0514e626.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_ec4c35ad18484c0b94ebb9017108181d.pdf?index=trueIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_8799fc58ee6a45a58a7d20b4317b3e03.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEC 4928 bytes
SHA-256: 13710e73ed162c7103c83cd4163f05a10c634d307583ad64b06d2ca56599e30e
font_01_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 15500 bytes
SHA-256: f44ce1df81b5de49e728dbcf6c6f813e0a4e4d06d7bb2600597278d90c77f20f
font_02_sfnt_off00013170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13170 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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