Malicious PDF — malware analysis report

Static analysis result for SHA-256 58fb84852a355766…

MALICIOUS

PDF

76.2 KB Created: 2021-02-11 18:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3306f627b7a2327f4324a3fb89ca78fd SHA-1: eef0360f82bf0f44c60063fc0541af9f6505473e SHA-256: 58fb84852a355766b7b8333273d64787c9e233716a23b0a6b9d8dfbd87e8a4af
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

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://jottigo.ru/wix?keyword=quotes+about+friends+with+benefits+funny PDF link annotation
    • http://vefipitop.22web.org/incomplete_dominance_worksheet_key.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/G0iinbB/kiburarovejozoxutogobafij.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/aoR8ghK/rizisubebu.pdfIn PDF document text
    • https://cdn.sqhk.co/jagugide/Vjhijgd/8405654710.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/42355052b.pdfIn PDF document text
    • http://zizaburixakog.iblogger.org/attention_love_ep_10_eng_sub.pdfIn PDF document text
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/2218955.pdfIn PDF document text
    • https://cdn.sqhk.co/duwewofowus/R4254Ct/lujuxefulufoguzoloxibi.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/2pabvo0/67318138347.pdfIn PDF document text
    • http://meetsucre.pro/domosonusinuxiki9jvut.pdfIn PDF document text
    • http://jotusuwes.iblogger.org/54474939445.pdfIn PDF document text
    • http://kraftmann.su/magical_adventure_balloon_rides_couponm0nqk.pdfIn PDF document text
    • https://cdn.sqhk.co/javepuju/P3gghc3/cnbc_futures_outlook.pdfIn PDF document text
    • https://tafifomoku.weebly.com/uploads/1/3/1/8/131856516/bf0982e.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/1uy3TTX/vereboxofiwibex.pdfIn PDF document text
    • https://warubexe.weebly.com/uploads/1/3/4/6/134647576/pakujabaloju.pdfIn PDF document text
    • https://cdn.sqhk.co/tusujoxaseru/TBujagd/fusujef.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/gvrMRCJ/visijaneduxeno.pdfIn PDF document text
    • http://yildirimotobursa.com/xevaxepukofarinixiktmwx.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/luramamelolem/caviar_dreams_bold_font.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/53718678740.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/canoscan_lide_700f_scanner_driver.pdfIn PDF document text
    • http://jidabalelibixu.rf.gd/beamng_cars_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/index_form_worksheet_tes.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_off0000ee8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8F 5356 bytes
SHA-256: 6390ca0ce8f26ed86b1b3317dfb55b0ae2f44526100581980595ddaabdec7763
font_01_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 10036 bytes
SHA-256: 505685f6aaad9c71ad836409c2743d937bde5d4da759b31a52e7a81ab197e1cd