Malicious PDF — malware analysis report

Static analysis result for SHA-256 27eb7e781c16db9c…

MALICIOUS

PDF

172.3 KB Created: 2021-03-30 03:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bd1df958781bfb236baccbaf7b348a5d SHA-1: 9c623b8c692740a25931a50fd4a065cb002692be SHA-256: 27eb7e781c16db9c7c990f610660e5fc34fce862c52c5cd958e2689ae5d27f9e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/wix?keyword=human+anatomy+and+physiology+10th+edition+answer+key PDF link annotation
    • https://molukubiluvu.weebly.com/uploads/1/3/1/4/131453067/268877.pdfIn PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/1729995.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496404/normal_5fca290478d7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365582/normal_5fef18f2a0040.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/xugetobisofateped.pdfIn PDF document text
    • http://energierecrute-emplois.com/jomajadivubewolujafedoxp5f1.pdfIn PDF document text
    • http://odemebayisitrafik.com/radish_seed_germination_ph_experimentlsqqv.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/ixahjmN/33506535457.pdfIn PDF document text
    • https://gekimirit.weebly.com/uploads/1/3/4/7/134700474/220048ce0.pdfIn PDF document text
    • http://baltika-trans.ru/mastering_the_rockefeller_habits_summarya56kk.pdfIn PDF document text
    • https://cdn.sqhk.co/jigijobofofa/jf8jhXX/sivunukuwebafererole.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/CbT1ghp/everfi_module_5_credit_scores_answers.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/5426434.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/ieiciZz/barilonulomu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428335/normal_6003c15c03e7c.pdfIn PDF document text
    • http://arenda-comp.space/helicopter_video_game_sega3r2uz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373998/normal_5fc696d01abb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_d4f9c78b10124f51951b525411ba04db.pdf?index=trueIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_ed03bb59b0704d648d8988862ebfd11e.pdf?index=trueIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_9adce1a3375e4a1eba59cfb3f8177cd0.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_off00025cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25CAC 5788 bytes
SHA-256: e4533bfda38655697bf724c59a74b93ddeee7fac078b340f36bd9682f6bdc672
font_01_sfnt_off00027040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27040 2048 bytes
SHA-256: 6a1e7f463c3437816ef786d7b7af359d0d910516da88c9c21dbdb28d22762a42
font_02_sfnt_off0002791f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2791F 11936 bytes
SHA-256: 9d022bcad0e776977056a3a7451fb67a6f7f79bbaf7743cb9fe6443704ef7377

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