Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c0c198865c2dd3…

MALICIOUS

PDF

84.3 KB Created: 2021-03-29 22:40:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c9a0ddaf0464236e36295f062e617a13 SHA-1: 42cc7017e5e11a8e034f2725fc33e5228db9c12b SHA-256: 22c0c198865c2dd3a732e0c84bcbce0d30461d8316bd4fc7c41fed41abc07044
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm or redirection mechanism. The primary URL, https://jottigo.ru/award?keyword=deep+pdf+a+deep+learning+approach+to+analyzing+pdfs, is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • 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://jottigo.ru/award?keyword=deep+pdf+a+deep+learning+approach+to+analyzing+pdfs PDF link annotation
    • https://mitenebomowal.weebly.com/uploads/1/3/0/7/130775142/4d098.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473640/normal_5fedb8f623044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417046/normal_605f713bbc3a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_603f2547cd26d.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/kurafed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472185/normal_5fcb8e3d2a632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493578/normal_603930a845d64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_605fa84a1c55f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_6040be71d95de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487618/normal_602734a91bc11.pdfIn PDF document text
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/bozexiki.pdfIn PDF document text
    • https://sejiganabukuja.weebly.com/uploads/1/3/4/5/134585043/6e08b055f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450638/normal_6032e89028e48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500446/normal_603bb5c98913b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482219/normal_601a707eda40e.pdfIn PDF document text
    • https://rovewavulitomu.weebly.com/uploads/1/3/0/8/130873995/2669034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_6010f79ad35d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_261a125430c340008c38e25e29494b3d.pdf?index=trueIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_47ac2506f4284d51835a659b30564de5.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_fb1d151bb6994aa597fce2e10082adb6.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_aacb91633b374c66b55e09de8babda89.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_a6053e84401749febee7d366d92ccc00.pdf?index=trueIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_f3bea6d92727472d831ba96722208499.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_1350a79ee78748d8b33e229762d5cb85.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_1e7ee8453c224dc39cbb6fde816ab94d.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_9583b4a841584dd7b9c51e0cb1b7b2e5.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 5568 bytes
SHA-256: 0011b31de09311a57ba07832fa92c8a739ee3531fd340ac46c9307e557b8bd10
font_01_sfnt_off0001224a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224A 10784 bytes
SHA-256: 8f1731c2a67db5ca03a78737aa96dab8197a2f631af9c033fb6c8b792e9e8355

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