Malicious PDF — malware analysis report

Static analysis result for SHA-256 976550fe2490f0cb…

MALICIOUS

PDF

81.0 KB Created: 2021-03-31 11:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6dbb43f1ab4e473ae79d1cde76be62d1 SHA-1: b2640ff5cf135de32347492d8ac57f309cba82f9 SHA-256: 976550fe2490f0cb10d67c0a808dcbf5f71f706a0a0ece98bb6e224e780bce77
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as search results for popular media. The primary malicious URL identified is vilenefex.ru, which is flagged as a redirector likely leading to phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://vilenefex.ru/wix?keyword=wolf+watch+season+3+episode+4+dailymotion PDF link annotation
    • https://cdn.sqhk.co/dijabidasu/N8sgf2U/tarot_b._o._t._a._para_colorear.pdfIn PDF document text
    • https://cdn.sqhk.co/ribafesupuro/aicKrCa/overkill_the_dead_survival_mod_apk_rexdl.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_2c89ef6704594e9c807b4be9028b04bb.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_2d6f35ae3c3041f7ba37a2bd6c98716b.pdf?index=trueIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_fb51a2dbf7044605bc716b4ab44c4feb.pdf?index=trueIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_714f122a22e0476289daeb9911d19583.pdf?index=trueIn PDF document text
    • https://598a1783-db1d-4ebb-96f5-d3ad23e1e090.filesusr.com/ugd/ae99eb_8bcaf1bb004b44d4b82f7ab55cf97733.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/simoxozibujuvoredebinixi.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/critical_chain_goldratt_book_review.pdfIn PDF document text
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_3e928f23036e4575b5eb87b778f89180.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/19947655076.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_a6b1958817904b36b7f386117f6081da.pdf?index=trueIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_e5ce61d6149243d19c693d7a8a6fb4fd.pdf?index=trueIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_e5dead2e22434019b82dcdb09c4fb51b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sezewu/influencer_rate_card_template_free.pdfIn PDF document text
    • https://06b91503-bda4-4bbd-a69c-520552d4e402.filesusr.com/ugd/07c5d0_d2fc1f01f02b459499981476946d48cc.pdf?index=trueIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_b4e28611b50c4c51b131cf2736209dde.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_5b8db16982aa4db6a24bcf47d822777d.pdf?index=trueIn PDF document text
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_9fd698626f9640168d199f2ca76aaae7.pdf?index=trueIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000ec59.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEC59 13680 bytes
SHA-256: 377f8ed344cef93200204adf0570815f01e00a33d44d2016f4ea835bbb2168e3
font_00_sfnt_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 5756 bytes
SHA-256: aa274378d5875f325c7819e95b21b162e458b90a9838ad956b8e1b5ac3e623c4
font_02_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 10328 bytes
SHA-256: bfb302aef8a5db7ed52d4197e524534000998197b23851c51b41320b4599db47

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