Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc221d3317961d4…

MALICIOUS

PDF

89.7 KB Created: 2021-03-30 03:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5cbcd04746b23ba6fa57f53f17a92c68 SHA-1: 56987895f9d4cdc0de533c1ae94401d05a0d62ec SHA-256: 5dc221d3317961d4ba56c5c58d3d6bfddb4f228bd860fc151d967a540befea2a
164 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 and presents a deceptive download button. 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-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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=3+times+tables+printable+sheets PDF link annotation
    • https://cdn.sqhk.co/pesuxitum/cZAhche/skyrim_summon_dragon_priest_spell.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483624/normal_604aa80984ac4.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/OifPhg5/70699419190.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/ggkSZKV/folding_bushcraft_knife_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/mepofazobi/9gihiIK/84908747578.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/Fkhejib/blender_v_2._75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457272/normal_604cc87c50078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://99ca13e2-8bf0-45b2-93fa-bbfb519f101f.filesusr.com/ugd/5392be_0e83183ec73b47f0ac98c73cfba90513.pdf?index=trueIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_4a7d3d00b13f4d2990743a924b829d18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01eabe3-93f3-4551-96ce-36f4ceb51d01/sudimuvin.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/43072150.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/rigitizenevurujawir.pdfIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_266396116446452c901ee4d31afb0b05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/geradi/guguvowod.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/gekafolifasaxam.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/detox_diet_plan_foods_to_avoid.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/what_is_statistical_communication_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/455181d8-82c7-4a08-b52f-f4f60456b100/the_metamorphosis_by_franz_kafka_summary_chapter_1.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_0ec6807830e045719925786c8aeb0aa1.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_1fcef12d767d4a4b8a2e3819f4100dfc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64c9f86-2079-4f85-a19f-5c945ef9fff9/free_printable_ukulele_chord_chart_with_finger_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf861ad-b355-413d-8ece-1b222337aba6/astrology_predicting_love_marriage.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/keto_mediterranean_diet.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_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 5268 bytes
SHA-256: cadd5de98ef7a5ef9667e2c7beb1d515418116d4d2cf4f6704027dfba502b299
font_01_sfnt_off0001326b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326B 11036 bytes
SHA-256: 95aa38e8b7547fc729a20a4003b7875229efa6e957927e10c93fddb6b25e60c8

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