Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b092f27a94bac3d…

MALICIOUS

PDF

76.5 KB Created: 2021-05-07 19:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a2dc810271f3becf58857b4bd87ce445 SHA-1: 20f804899d9a77b6ca964db32ab7c41071064f01 SHA-256: 8b092f27a94bac3d6e2f1d7b151da2f68b1d2d9fb60e09231bcb795e4287d84e
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a high number of embedded links, many of which point to known malicious redirectors or suspicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The document body, though heavily obfuscated, contains text fragments that appear to be lures for search engine optimization, further supporting the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://yafferge.ru/strik?utm_term=how+to+structure+a+speech+ks3 In PDF document text
    • http://vzruvayarttraff.xyz/how_to_use_thinkorswim_chartsfe0xx.pdfIn PDF document text
    • http://dewobazul.22web.org/context_clues_worksheets_for_grade_9.pdfIn PDF document text
    • http://expressvpn.store/minecraft_apk_1.8_0.8_indir39d7t.pdfIn PDF document text
    • http://vengriya.space/kuching_good_food_guidel3ssm.pdfIn PDF document text
    • http://freshka.fun/63750184469itczx.pdfIn PDF document text
    • http://avlto.best/80881437301l2zk1.pdfIn PDF document text
    • http://ig-supportcenter.xyz/change_of_address_form_dmv_oregon6vu5e.pdfIn PDF document text
    • http://shop50off.info/fibiwanamavivereruzah8len.pdfIn PDF document text
    • http://zasoremejoka.iblogger.org/26887092152.pdfIn PDF document text
    • http://goldenframecollision.com/problemas_de_notacion_cientifica_resueltost2qw5.pdfIn PDF document text
    • http://brumbum2.xyz/tintin_the_castafiore_emerald_summaryi2i2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_177d7c5f7192486c87e81d4c845f5968.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_3659232f871d484db990e4b086e2e167.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/syringe_filter_membrane_selection_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/algebra_gcse_worksheet.pdfIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_9512fc8918924de485974ecbc0fc719e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/ryzentosh_mojave_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/mink_russian_volume_lashes.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/sizigunuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/beats_solo_4_release_date.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_6a36fbf2a02f4517aadd6a9bd5b6488b.pdf?index=trueIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_3632bde48c234cc6970590482f86d09d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/34328423088.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_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 5268 bytes
SHA-256: c3d57de31142330253def00fda61d028e9fd64d4ed07a6a9f68b13fea494ee06
font_01_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 10784 bytes
SHA-256: 41c134ad7a0804794d669118f45ed2590ca61f0e9c61ff1ed8c727232cbb14c4

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