Malicious PDF — malware analysis report

Static analysis result for SHA-256 613cfb5e810acbe7…

MALICIOUS

PDF

76.0 KB Created: 2021-03-03 21:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d0c59057eb36898139b8ce217cf653fc SHA-1: 990ffbeb4a1905d8efa589be82d355928bb558e3 SHA-256: 613cfb5e810acbe788eab7f2ab646f36822b645f31221b838915708206aff10e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. 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 0.9998

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://jumiwimov.ru/wix?keyword=walmart+fire+safety+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401691/normal_601134c8ea8d5.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/iejfds4/mtn_momo_charges_to_other_networks.pdfIn PDF document text
    • https://cdn.sqhk.co/gidowoji/cgjigQV/zas_zombie_apocalypse_simulator_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_601160848312d.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/gepegazisurilo-wulogave.pdfIn PDF document text
    • http://kupugula.iblogger.org/2013_ap_statistics_free_response.pdfIn PDF document text
    • https://kekulepolunan.weebly.com/uploads/1/3/4/8/134889268/jepixijivubesiwafa.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/dw46WeA/strategy_role_interview_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/kifukuvitog/ifhaThb/yellow_wallpaper_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/hdhhifW/84662574177.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/4hgmjd1/alarm_clock_app_for_windows.pdfIn PDF document text
    • https://gudifikopar.weebly.com/uploads/1/3/4/6/134627505/c3f909c8324.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nafabumawo.rf.gd/husqvarna_t435_specs.pdfIn PDF document text
    • http://webuwerogoken.rf.gd/how_long_does_hyundai_warranty_last.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/dengue_positive_blood_test_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/fomojupajizozimezotusawu.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_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 5120 bytes
SHA-256: cd4adc4df8c6710fa87647e0c81b25a1c1921e7134b3e44ca82c0cf4defae351
font_01_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 10832 bytes
SHA-256: 944cc3b428cb3c05ce255ba0c666e97ef4875519097eff8c4ecb624e361104d9

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