Malicious PDF — malware analysis report

Static analysis result for SHA-256 1394fb4ff70b7d04…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 14:38:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d864a14deb9e7295e95b991d92d07e39 SHA-1: 4db0defc1e924bbaf4d28cb6085e1a66f6d3a5a7 SHA-256: 1394fb4ff70b7d04088f597d2c22b694c109ad0de09009e467938fd430db84cd
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it is a PDF phishing trojan and contains a link farm. The embedded URLs, such as 'https://nipisod.ru/wix?keyword=1923+silver+dollar+value', suggest a lure related to valuable items, likely to trick users into clicking. The presence of multiple external links points towards a campaign to distribute malicious content or engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=1923+silver+dollar+value
    • http://kvyovk.xyz/apc_smart-ups_1500va_specsu3r8q.pdf
    • http://fruit-italy.space/352004498543peg5.pdf
    • http://formblckr1.xyz/vidmate_er_android_phone6suok.pdf
    • http://lovelid.xyz/bc_rental_agreement_formkjkrd.pdf
    • http://oneitshop.info/is_acer_predator_helios_300_good_for_gaming3c23p.pdf
    • http://gefaveje.22web.org/nomaxobefefijibopulijax.pdf
    • http://hyipinvest.site/xevetedowujm2su6.pdf
    • http://bcpreactiva-enlinea.com/911095922667obfa.pdf
    • http://spoonnumberone.xyz/android_studio_screen_capture_devicete7be.pdf
    • http://melapotu.22web.org/gagiwosinimawisugab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_0348c710e0674e6faad24a48a08f67ee.pdf?index=true
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_03dd4ae54b784959a27c63564f9fcc5d.pdf?index=true
    • https://6f46ab72-b8e3-4ec2-8f01-cb5d6491dab7.filesusr.com/ugd/9a120b_38a61f02ac8b408d8dd5d1d47857ffc9.pdf?index=true
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_6fba52a54457434a9d3ec560339566c6.pdf?index=true
    • http://pewavifasovifuz.epizy.com/43103553003.pdf
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_6060f53938f347de920350fa1f501f1a.pdf?index=true
    • http://tibofova.epizy.com/raving_fans_ken_blanchard_free_download.pdf
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_48bf5cf709e341de9d3249255debda4d.pdf?index=true
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_5b7310828d4c453a811fd2f3543585e0.pdf?index=true
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_eb105587d4a443d9af253f252da7e170.pdf?index=true
    • http://jatitubez.epizy.com/arquitectura_sostenible_libros.pdf
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_dc55d2e09c7b45b3a5fc8afb41a5f456.pdf?index=true
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_2914a9c296c0439188951db26bd7c4e6.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb65.bin
73e7377b2aaaa07ccf72bf8316b9f14d50fd7119b7140a3a095a7de46e849611		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 5288 bytes
font_01_sfnt_off0000fd70.bin
91c15ad044352e5d16ee4174d28b8c2505925ccd0069596721d2e310e55981c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 11380 bytes

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