Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8394aa53946657…

MALICIOUS

PDF

109.2 KB Created: 2021-03-18 19:19:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1a9fb4ec9a27ebe066df67b49029026 SHA-1: 9f95dea797d293e9dc10d1c6cb0c673d6d856632 SHA-256: 5d8394aa539466571bacf995fe08f5a6ceadc9ad9381475f1a4c662b0cfb0ef9
226 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to disposable hosting services. The document's content and structure strongly indicate an advance-fee scam, likely attempting to trick the user into clicking a link to claim a prize or parcel. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://nipisod.ru/123?utm_term=un+written+assessment+test+sample+pdf
    • https://tirokaroxere.weebly.com/uploads/1/3/2/7/132740449/587a3.pdf
    • https://tarakemutelomul.weebly.com/uploads/1/3/2/3/132303353/falidubivo_rugowu_babogipodisu_jomoxus.pdf
    • https://cdn.sqhk.co/putizimetiwe/iiZhaij/my_disney_movie_club.pdf
    • https://wigabededonekan.weebly.com/uploads/1/3/0/7/130740374/kunerebowavud_duvitekozug_lozuz.pdf
    • https://vilawamilufulob.weebly.com/uploads/1/3/6/0/136006615/nalojuxefun.pdf
    • https://cdn.sqhk.co/pulurune/fegiWid/kixafibanevu.pdf
    • https://zekasujiminog.weebly.com/uploads/1/3/4/3/134366003/lopekupimilo.pdf
    • https://cdn.sqhk.co/vefasebo/jgv6nch/myrkur_band_merch.pdf
    • https://sisareses.weebly.com/uploads/1/3/1/4/131454440/domizivinixikex_kawuf.pdf
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/4439065.pdf
    • https://wapafakomix.weebly.com/uploads/1/3/4/7/134740591/zupulawoma-tijowixifew-zatidowuka-metijoj.pdf
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/farepetedinag.pdf
    • https://rugalasaludazi.weebly.com/uploads/1/3/4/6/134683923/xixitar.pdf
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/7779068.pdf
    • https://kolekidir.weebly.com/uploads/1/3/4/4/134441437/bamagowoxifikide.pdf
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/3326042.pdf
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/d40bdce.pdf
    • https://vukuxafutuzex.weebly.com/uploads/1/3/2/3/132303027/3255780.pdf
    • https://vagajexaxe.weebly.com/uploads/1/3/4/3/134359414/9691907.pdf
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/ratujukum-zefetexebux-mozagawususib.pdf
    • https://cdn.sqhk.co/lekibapufe/bqigejd/chicken_running_with_head_chopped_off.pdf
    • https://vigaziwow.weebly.com/uploads/1/3/4/3/134322068/114cd.pdf
    • https://cdn.sqhk.co/tekixonef/Wvhijbu/1063999442.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_ebe6d948388b4ae9835aa02faad38750.pdf?index=true
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_eb8a399bc236478c8ade7232accdefbf.pdf?index=true
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_85f73f09c3ae4604895c8b5f6579097f.pdf?index=true
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_d71c4857373c4d5cbfefdf013ba19bb6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e2c.bin
98d7be73dbcdfc408709c9826e2d363cce21bda47af3d8ff7be5d726840bf05a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2C 5268 bytes
font_01_sfnt_off0001500c.bin
d084cb324b58c177bd49cd0b899fea8f702d3ead679af07b7376169eea6efd61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1500C 4432 bytes
font_02_sfnt_off000160f3.bin
cd18790a6a690d7a6ab3ec77e13337d84282d32754d74f5b5f048112967bbdb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160F3 11256 bytes
font_03_sfnt_off0001875f.bin
68f69f0a522c811ba46ec8cb883e2bee02348321f2abab73ef070e8d23223aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1875F 19000 bytes

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