Malicious PDF — malware analysis report

Static analysis result for SHA-256 555071ef3800e08c…

MALICIOUS

PDF

102.7 KB Created: 2021-03-10 01:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea8141fc7e00cbb15e075dcf9814c252 SHA-1: 697209c0b04dc921661c5825ae687b2bab67b05e SHA-256: 555071ef3800e08ce5f235b248841a3ac871a0bd93669d88dcdade1f2f91ba72
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection to these numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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
  • 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://soxebez.ru/123?utm_term=excel+bedingte+formatierung+andere+zelle+wenn
    • https://gabamavipe.weebly.com/uploads/1/3/3/9/133999819/rukapew_xorojarojese.pdf
    • http://kitukotobov.medianewsonline.com/56037417611.pdf
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/7818447.pdf
    • http://wuroguredogir.getenjoyment.net/34944340338.pdf
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/xafeduruwojipasewov.pdf
    • http://nazorizuz.medianewsonline.com/pitimewesugi.pdf
    • http://napufokotipo.getenjoyment.net/argumentative_paper.pdf
    • http://resokipuga.getenjoyment.net/zowodasezijaloge.pdf
    • https://zejobivajetipud.weebly.com/uploads/1/3/0/7/130740466/zobufuriwija_wuzutoduxuvax_wupikuzefu.pdf
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/zuxuva.pdf
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/zuvobupivulota-nafuwopubenobid.pdf
    • http://zedateve.mypressonline.com/english_learning_app_free_download_apk.pdf
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/76258266d1.pdf
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/jivuna.pdf
    • http://worameruvejaka.mywebcommunity.org/77898509738.pdf
    • http://mizafaroremida.getenjoyment.net/shatter_meaning_in_english_dictionary.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nejesezape.myartsonline.com/how_to_write_23_hundredths_in_decimal_notation.pdf
    • http://tuxusar.epizy.com/final_fantasy_xv_review_2020.pdf
    • http://rimuvuvipimube.epizy.com/mawigomejokido.pdf
    • https://s3.amazonaws.com/sugowubuf/guided_reading_level_app.pdf
    • https://s3.amazonaws.com/zategafozasiru/26238356760.pdf
    • http://zubaxajetalomu.rf.gd/kuwidilikemowogorawitarik.pdf
    • http://positajugopisu.myartsonline.com/genie_garage_door_not_opening_with_remote.pdf
    • http://lirifamagugo.rf.gd/53860475006.pdf
    • http://vuruwabudakase.epizy.com/41034060928.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_off00014e1d.bin
62450b690bbebf58c0902ff5e7425fd243eca93eac917c7c5b7e10523af95f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1D 5472 bytes
font_01_sfnt_off000160c8.bin
b26016647915797872046a2a9fcd30f66f1aeb6182ad156dcf210ec17eecbf58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160C8 13960 bytes

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