Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2fb28328daf91e5…

MALICIOUS

PDF

123.4 KB Created: 2021-03-26 18:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0141fb6cd11758edb798c81bfc376688 SHA-1: 14065aab27775e0182b09da2f0cab71adc8e4f5f SHA-256: d2fb28328daf91e58bee8f14996de3c6ce4becfc38d1870a6a4cca0b81c1edc4
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/award?keyword=sonda+vesical+cuidados+pdf PDF link annotation
    • http://shoppermarket.online/zadoxapx58o.pdfIn PDF document text
    • http://onlinesos.tech/dasuxipuvekabevotusubuskxrzy.pdfIn PDF document text
    • http://xumizuxo.22web.org/what_is_managing_scarce_resources.pdfIn PDF document text
    • http://meetsoda.pro/adobe_xd_cc_fully7qk7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_2adaed5b2c1647939a06c833f0fdd94c.pdf?index=trueIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_67d4e9cde0414a8b9bb0b70e20df9a05.pdf?index=trueIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_45e14aac4d944b70a0b0dfb2368b25af.pdf?index=trueIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_d1ec9375d1d745c299d535f5db2e2af1.pdf?index=trueIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_8b154b707da249b493a2d15d37586ff0.pdf?index=trueIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_bb1dab56eea145c6bb573fdcac885ef9.pdf?index=trueIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_d7793ae060434322808a2e8544da0d93.pdf?index=trueIn PDF document text
    • http://sedepijenokarol.epizy.com/cataphoric_and_anaphoric_reference.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/warhammer_path_to_glory.pdfIn PDF document text
    • http://jenilonadal.rf.gd/6968864244.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_d8271afb70824b519f00ab5c08140efd.pdf?index=trueIn PDF document text
    • http://fuzazoxavuvuw.rf.gd/are_k_cups_and_k_cup_pods_the_same_thing.pdfIn PDF document text
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_037b3110b04c4d70b9e546f1b0b6ca7b.pdf?index=trueIn PDF document text
    • http://dixasimoxipux.rf.gd/chapter_25_manicuring_study_guide_answers.pdfIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_b8f0f219ecf04717bd1aabb9030a1b97.pdf?index=trueIn PDF document text
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_1a0c476665554501bfdde0a9d041db40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/3rd_person_singular_present_indicative_form_of.pdfIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_5e313c07f8b9446eb221f1933faa2316.pdf?index=trueIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_dc772723cbcf45c0b4d5acf0c1e69e0e.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001906d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1906D 5020 bytes
SHA-256: 66979ced9f6f141bb858dd170d50b67fa51d011d94a532580ac3388426aa46ea
font_01_sfnt_off0001a194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A194 16192 bytes
SHA-256: 20309cbf0cc6ab3d6f3bf1771378198c62519b68c0013980f30af3b45cc9bcbd
font_02_sfnt_off0001d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1E2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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