Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37f9e881736685e…

MALICIOUS

PDF

72.8 KB Created: 2021-04-01 16:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9734e0b293727d869414a53ecc679da7 SHA-1: 580b08096797aae17e8ddb621888c52a77e29a7e SHA-256: b37f9e881736685e82dd54199cdd426bb75da03d8ad2ee45d357408c1f67c77c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/award?keyword=gis+10.+1+tutorial+pdf PDF link annotation
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/da349a47.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/rokimokekatod.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/zifuguvomawo.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/hgBhiQr/reversibility_psychology_defined.pdfIn PDF document text
    • https://puxasune.weebly.com/uploads/1/3/1/3/131379014/0bc7f40.pdfIn PDF document text
    • https://bajukurufutot.weebly.com/uploads/1/3/4/5/134525313/rigob.pdfIn PDF document text
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/6959098.pdfIn PDF document text
    • https://cdn.sqhk.co/soxesemu/UUJjhRF/15040302475.pdfIn PDF document text
    • https://kenazago.weebly.com/uploads/1/3/1/0/131070597/gerob_rodazusozo_retotomugar.pdfIn PDF document text
    • https://cdn.sqhk.co/penuvipaw/i58xhcA/vaguvegejewu.pdfIn PDF document text
    • http://rusakova.space/the_last_house_on_the_left_1972txufv.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/jfhcjin/91277733908.pdfIn PDF document text
    • http://xivowotulupom.iblogger.org/6008867344.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/kuwosamavimovet.pdfIn PDF document text
    • https://vagenovujod.weebly.com/uploads/1/3/1/3/131398358/215d6d4.pdfIn PDF document text
    • http://tuvivukaroj.mygamesonline.org/1104485484.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/accord_des_adjectifs_numraux_cardinaux.pdfIn PDF document text
    • http://bizbize-yeteriz.org/pdf_books_free_download_websitesffctx.pdfIn PDF document text
    • https://cdn.sqhk.co/xakutofi/Bje1jjm/bewizuzig.pdfIn PDF document text
    • http://kizisuruz.22web.org/typographic_design_form_and_communication_7th_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bikukasosisado.epizy.com/avg_cracked_apk.pdfIn PDF document text
    • http://pikatipiwaxu.rf.gd/2012_dodge_avenger_rt_price.pdfIn PDF document text
    • http://kulolepan.rf.gd/vorupikeginukejonebolekir.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/dedisero.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_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 5292 bytes
SHA-256: 17c65ad1213fabea1cac1edcf08f17e0e426af62c4e845a49ca93d991844373f
font_01_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 10884 bytes
SHA-256: 4ed80fead3b08f6bc36e5ca178359a3cbcc465aee9f40f9a37eebfb87087c8f8

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