Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b2698299c8f75e…

MALICIOUS

PDF

77.2 KB Created: 2021-03-28 18:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0ed99248199cbd9ea351dfafeb433ce5 SHA-1: 56cf1059c5e2883fec3f38f9420be11f65d831b9 SHA-256: b5b2698299c8f75e83eac254c9cf0982071c4facfa6793be91a4d92e9246859d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF SEO link farm. The document contains numerous embedded URLs that point to external PDF files, suggesting an attempt to drive traffic to potentially malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=anti+corrosion+coating+pdf In PDF document text
    • http://digitalmicroteter.xyz/mejirenotitomihqq2.pdfIn PDF document text
    • https://cdn.sqhk.co/mazinenik/go0hgdK/subway_princess_endless_run_mod_apk.pdfIn PDF document text
    • http://my-favshopg.online/lurigipolibigexjkh29.pdfIn PDF document text
    • http://getsol.xyz/breaking_benjamin_ashes_of_eden_songus577.pdfIn PDF document text
    • https://cdn.sqhk.co/fagevibe/e6gtbpo/likee_video_editor_app.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/hMCNjax/sovosezud.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/ehdgePS/pipalesoroluwuzaruxuxuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370068/normal_5fc8b3b864228.pdfIn PDF document text
    • http://profer-opt.ru/38947545039vajt8.pdfIn PDF document text
    • http://alsamcctv.com/acurite_digital_thermometer_not_workinggjytx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_6013ec6781452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_604914c3ca8f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475571/normal_5ff75e331ac51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_c47437924b59494e876d379b131dccd8.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_c0970248e01a442d83169db5571f7c71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/examples_of_social_learning_theory_in_everyday_life.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/mitifomuwilubedasef.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/25909379140.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/bosch_pbh_2100_re_change_drill_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/757020969.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/rival_ice_cream_maker_instructions_model_8401.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/cedarwood_doterra.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/63561605106.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 5280 bytes
SHA-256: c99b0d17e693fc7e59f1b4a78ba9c65ce51e7e233d0481b67a10879a7d81b90e
font_01_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 10452 bytes
SHA-256: e87e7b5ba2cc38b960f7444fea7d6cdbf871a3ecb90718d6a045c2c15b54b71e

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