Malicious PDF — malware analysis report

Static analysis result for SHA-256 b277cc4c6d29fa43…

MALICIOUS

PDF

74.4 KB Created: 2021-03-27 23:36:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1187c22ddb6b6657c0189b624250c8c7 SHA-1: 09f5a2805f968bc73851cd8c3abca75667d0f168 SHA-256: b277cc4c6d29fa43fbea84eeae507744c7c626c9967e0ede099e02f116f3eae3
184 Risk Score

Malware Insights

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

The PDF contains a high density of links pointing to disposable domains, many of which are associated with malicious redirectors or link farms. The presence of 'cracked google store apk' in a URL suggests a lure for potentially unwanted software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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/123?utm_term=cracked+google+store+apk In PDF document text
    • http://xijewaka.22web.org/jikame.pdfIn PDF document text
    • https://maposege.weebly.com/uploads/1/3/1/3/131378999/2172598548b5c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384468/normal_60459caa2800a.pdfIn PDF document text
    • https://cdn.sqhk.co/lamidipeke/bjirpLi/2587715138.pdfIn PDF document text
    • http://jushq.club/hp_z440_release_datezst4j.pdfIn PDF document text
    • http://matcobzor.ru/auto_body_shop_near_me_open_saturday5ddbr.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/jhQprWv/luna_s_fate_mod_menu_apk.pdfIn PDF document text
    • http://vilopeg.xyz/81729333535kjsfr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481540/normal_6010590c9ff1b.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/ibieibb/26956642434.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/e5sLEng/70933456171.pdfIn PDF document text
    • http://bowoluzin.iblogger.org/rodawinexafexufazovap.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/9384840.pdfIn PDF document text
    • http://tesapewuj.22web.org/faces_edges_vertices_of_3d_shapes_worksheets.pdfIn PDF document text
    • http://probkin34.xyz/lurijipebalogam3nrxl.pdfIn PDF document text
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/kobaligepo.pdfIn PDF document text
    • http://parralax.net/wetegajenapip5853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444853/normal_5fe9ef99eeeb0.pdfIn PDF document text
    • https://cdn.sqhk.co/fojizejoxu/8ibjdXv/59661716471.pdfIn PDF document text
    • https://zofifonanofanap.weebly.com/uploads/1/3/4/8/134876640/xezokexajeviweb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kisuvixoj.epizy.com/the_birds_summary_daphne_du_maurier.pdfIn PDF document text
    • http://jawuguv.epizy.com/2_colour_acrylic_sheet.pdfIn PDF document text
    • http://sutugigadariw.epizy.com/96123024945.pdfIn PDF document text
    • http://toxogus.rf.gd/how_to_redeem_minecraft_code_on_switch.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_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 5212 bytes
SHA-256: 77199420c65846ac3eb3d242dc9daf8905e99af56238ae77a94ac99909155f57
font_01_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 10556 bytes
SHA-256: c30bc27d744f040ed39e802dcbd8979068280aba7e6e578a3c4183852e9365f4

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