Malicious PDF — malware analysis report

Static analysis result for SHA-256 45759c11b5113fd8…

MALICIOUS

PDF

98.2 KB Created: 2021-03-18 07:36:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0bec10ee270f7eaa46942720ca5f0574 SHA-1: ebab06bb9b84a0b1754887db4ed2d8148a554d61 SHA-256: 45759c11b5113fd83f085fb1244c7f7eade77169abf577508edc1a6dd3b88daa
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based 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 0.9997

Heuristics 7

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ponafet.ru/123?utm_term=haemophilus+influenzae+isolation+guidelines PDF link annotation
    • http://sallehq.xyz/adding_fractions_with_like_denominators_worksheets_3rd_gradebzdza.pdfIn PDF document text
    • https://zukudanasoxe.weebly.com/uploads/1/3/2/8/132815154/miwun.pdfIn PDF document text
    • http://kavademive.sportsontheweb.net/british_architectural_styles.pdfIn PDF document text
    • https://cdn.sqhk.co/givinonu/EigcQGn/hungry_shark_evolution_mod_apk_unlimited_health.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/e8c0e03be.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/shajfjj/othello_emilia_character_development.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/gfzjjgj/mibixefiguwejavogi.pdfIn PDF document text
    • https://golewobewawir.weebly.com/uploads/1/3/4/3/134350879/5318851.pdfIn PDF document text
    • http://power-guard.shop/5761243688at8fr.pdfIn PDF document text
    • https://mibonapa.weebly.com/uploads/1/3/4/3/134308174/lazoterejij-xefasimak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8bce96-b317-4c4c-92b1-a0df817e0023/corsair_cx750_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94806dff-52c1-4733-aabb-b17349b249aa/how_to_factory_reset_adt_safewatch_pro_3000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67bbc844-cc17-4c62-b2da-6f84b013b3e9/tissot_t-touch_connect_solar_amazon.pdfIn PDF document text
    • http://lawaxisagiwog.atwebpages.com/sap_erp_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a2de6d-c61f-4c42-b824-7b7b96bb266e/solazozomivudokexatuval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3bc467-a365-46bd-8a51-de30de084818/dsc_alexor_remove_zone.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_off0001451c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451C 5372 bytes
SHA-256: 55a3742915232feb417de3ced771aeef85b26d7295a28f8401fd87560f29a8b0
font_01_sfnt_off00015749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15749 10700 bytes
SHA-256: 4e697c3ed34062a55382be567f59193b82f2c469eb986b2d83dc1a17cdbe2b4a

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