Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb90bf8f5d695a2…

MALICIOUS

PDF

80.4 KB Created: 2021-03-29 10:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f5ab9409067418bab7f280e4d391385d SHA-1: 1f9ad77d05c19675f97be0fea44c4dd42a2c5522 SHA-256: 1cb90bf8f5d695a2cb94bb1128bc9df23ee490f601484ba95ee32f0e6e1577f3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a suspicious URL that appears to be part of a link farm designed to attract traffic. ClamAV and ML classifiers strongly indicate malicious content, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=tex+to+word+online PDF link annotation
    • http://pidusejop.medianewsonline.com/how_many_cubic_feet_is_a_kenmore_80_series_washer.pdfIn PDF document text
    • http://xivatididoxu.22web.org/nalipujamevavesilab.pdfIn PDF document text
    • http://kavelokafozi.medianewsonline.com/6015854079.pdfIn PDF document text
    • http://jolidulikan.scienceontheweb.net/when_will_the_next_wings_of_fire_book_14_come_out.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/afinador_de_guitarra_apk_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/bhojpuri_movie_2018_mp4_hd.pdfIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_c48f5dc8c9c0440ab4c2f5f628a32e2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/reporting_goodwill_impairment_loss.pdfIn PDF document text
    • http://lovekegikowuf.rf.gd/wujubomobukek.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/pideget.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_5e4061e433f54b109c43eb4a944c727d.pdf?index=trueIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_8c9903a5ac0148f4a96b3b7db53b58c9.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_6751df6915d44582a86a524508daa027.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/tudakodivovedikaburarab.pdfIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_57a999b8ad1d421fad580c74c139d1e7.pdf?index=trueIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_bfe3cf3db33e448fa909e37d0e72494d.pdf?index=trueIn PDF document text
    • https://43dda2ad-fadc-418c-a2d5-4b96cca2ed60.filesusr.com/ugd/6eca9c_98fba13a61ad4bdea9bcc004c53e6ec1.pdf?index=trueIn PDF document text
    • http://zojexajori.epizy.com/88422588376.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_b76d5c1cb1314949855e6cfe01e03abc.pdf?index=trueIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_2d0d5559202d445db80850eb788124a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/what_is_nightmare_fredbear.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_fd0a04eebc224347a925262dc60c136f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/powazowar.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 4540 bytes
SHA-256: 270fbe3f58311edcf7033c28baf331ea632849a739e3f2662c15d444aaac7753
font_01_sfnt_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 11012 bytes
SHA-256: 1368159dfd54e381b666df9b4d5165a22363d2d193409798ca97fff4d0d01cb2

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