Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbb6708cffbddb1…

MALICIOUS

PDF

87.1 KB Created: 2021-04-06 04:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57b9938c63f0a286f930ae1fd2a8fb54 SHA-1: 86909154dbf999e1bc45e66d951a7455818d042f SHA-256: 9bbb6708cffbddb1b24affbea8c938c04bc6136a1e755afe07e36a5e853fe42e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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
  • 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://fokemale.ru/award?keyword=corpus+delicti+juli+zeh+pdf+download PDF link annotation
    • http://muzibatixabu.mypressonline.com/budapest_map_attractions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_6030880fa4528.pdfIn PDF document text
    • https://zatozidebowetam.weebly.com/uploads/1/3/1/3/131398213/sotoxa.pdfIn PDF document text
    • http://openlait.pro/fodalomikolajularewuropbv9xy.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/zuwarapovitu.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/4520591002.pdfIn PDF document text
    • http://zosujobitusup.iblogger.org/length_of_an_arc_worksheet.pdfIn PDF document text
    • http://ninezif.iblogger.org/does_an_irregular_mole_always_mean_cancer.pdfIn PDF document text
    • http://allieshouseofhope.com/genie_2024_set_limitsq30d9.pdfIn PDF document text
    • https://rovizefodizare.weebly.com/uploads/1/3/4/3/134309954/jukazin-sivogedadatu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460447/normal_5fe4b7518e843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_602717e9585ad.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/wixanarer/les_miserables_sheet_music.pdfIn PDF document text
    • http://zugonazidojofe.epizy.com/stihl_weed_eater_head_wont_stop_spinning.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/dijaroga.pdfIn PDF document text
    • http://nudowuva.rf.gd/wesozekigawovasijadowapop.pdfIn PDF document text
    • http://sibiziditex.epizy.com/how_did_christianity_really_start.pdfIn PDF document text
    • http://xirexadugimog.atwebpages.com/definition_of_internal_auditing.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/kabew.pdfIn PDF document text
    • http://wilaroxu.atwebpages.com/quantity_adjectives_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/nofopunabixewadoginivibe.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_off00011316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11316 5364 bytes
SHA-256: 0b30b01aceb066c34d29712aa924ff3ff92e6dcb572352afac9a46efdc08a3f2
font_01_sfnt_off00012568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12568 12532 bytes
SHA-256: a81a2a4941e39cf01633d27abe6fbcabae6d61cc51e19ac1e4629ddb0fb8781a

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