Malicious PDF — malware analysis report

Static analysis result for SHA-256 946963bf0c11b2c8…

MALICIOUS

PDF

66.9 KB Created: 2021-03-05 21:47:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 641549ef01249a50049e2c8b27cd5cad SHA-1: 3e38c31e29d154c5d9589af22b5a171ac67e577e SHA-256: 946963bf0c11b2c82332d018c2ba5e03ec6c0cd0d01fc4606deba6a36832ec12
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm used for SEO poisoning or redirecting users to malicious sites. No scripts were extracted, but the overall structure and external links point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://maypoin.ru/wix?keyword=vocabulary+workshop+level+f+unit+13+answers PDF link annotation
    • http://aycotoro6.xyz/why_my_laptop_wont_connect_to_wifi4c6yq.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/idIjiPj/bubobonogeg.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/11335728943.pdfIn PDF document text
    • http://fertpin.online/equivalent_fractions_year_5_worksheetyjzl6.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/nutojexowowuva.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/what_is_the_best_stick_vacuum_to_buy.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/how_many_electrons_can_4d_hold.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/davugoku.pdfIn PDF document text
    • https://cdn.sqhk.co/nigudovowa/thc1Ljb/riposijiwur.pdfIn PDF document text
    • http://cesaregaspari.com/big_five_personality_traits_testij888.pdfIn PDF document text
    • http://gratoraama.website/gajalizuxupevugajudiwiwtcxuz.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/vudupogiludodozaba.pdfIn PDF document text
    • http://idealica-columbia.site/how_low_should_you_keep_your_carbs_on_ketog28mm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_c7497341da5a44aab8852fe78d1c0b75.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/telasebisu/review_celestron_nexstar_8se.pdfIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_580d6943e62d4c7e980bd8d650f16ff0.pdf?index=trueIn PDF document text
    • https://b6b48848-b4e5-45fa-8615-5078b9c10b0e.filesusr.com/ugd/94e5ef_081f2bfd630d45d89d5a7a795bec5490.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/nuzaki.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_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 5740 bytes
SHA-256: b6e782da3fde0d390bfc7933fec2a7e39bd9374136a7dbca9ffc48545d1abe35
font_01_sfnt_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 9924 bytes
SHA-256: 311c492fb633973e41b5f52fc394b43ea5103a1af86235253b0b0f66365a717e

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