Malicious PDF — malware analysis report

Static analysis result for SHA-256 757e4a527adb910b…

MALICIOUS

PDF

78.4 KB Created: 2021-03-29 06:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 206779be5d773ebf72cdb6a17d6b6566 SHA-1: 1281c2222207f4a102fcda4beb7f280d6b0a4073 SHA-256: 757e4a527adb910bae5b19ee33cceb21aec7f99ef592a446f2c902a13e409d70
146 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. It uses a callback-phone (TOAD) lure. 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 0.9993

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/strik?utm_term=saipa+pe+exam+dates+2020 PDF link annotation
    • http://inostrana.com/la_la_land_epilogue_piano_scoreufdc4.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/gi5hetR/best_anonymous_texting_website.pdfIn PDF document text
    • http://mishabelle.ru/how_much_is_back_surgery_for_a_dachshund_uk9tfly.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/nhfhgsq/train_driver_train_simulator_driving_games_mod_apk.pdfIn PDF document text
    • http://bestgirl69.com/gidovufoganowirijial9rm.pdfIn PDF document text
    • http://ig-mediateam.net/harman_accentra_combustion_blower_motor5ulkv.pdfIn PDF document text
    • http://1fps.ru/96114685642b937r.pdfIn PDF document text
    • https://cdn.sqhk.co/kitatoze/43jdhb7/super_penguin_basketball_2019_vietsub.pdfIn PDF document text
    • http://draiwenstore.online/xozevoposalumijevu5bs2t.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/74082876096mxy9z.pdfIn PDF document text
    • http://mavidodi.iblogger.org/bbq_flyer_template_publisher.pdfIn PDF document text
    • http://firejifanop.iblogger.org/linebacker_drills_for_taking_on_blocks.pdfIn PDF document text
    • http://pedron.fun/walmart_tv_black_friday_2019_ad8498t.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/dell_s2415h_manualua2e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e7e1611e-f78d-4dfd-b5ce-3be5f579732f.filesusr.com/ugd/4b76a6_c9370a168a9d43b9a1e834c620b54da5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/stringbuilder_reverse_in_android.pdfIn PDF document text
    • http://gefafeduvul.epizy.com/mebizederadefut.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_bb6f429bf7e74c619515417bed027af5.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_aa71d8022d3744ba94b227210f00276c.pdf?index=trueIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_31e90f9c9e764bfe923abd03cb25e16b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuxime/49951781435.pdfIn PDF document text
    • http://nogomazarem.epizy.com/zuzukafukopapel.pdfIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_fca0b895ae4e4ee496027d805a199087.pdf?index=trueIn 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_off0000f3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 5424 bytes
SHA-256: 8a54c585cf515081fd585a64d3bc6e013428b72ae8b7568e1602cad359a06759
font_01_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 11356 bytes
SHA-256: 62b37cd1ad5fe8707de3e7a4e6f0669a27c496a48f4d555420d7b85b121454a5

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