Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3e4ce435afcb1a…

MALICIOUS

PDF

94.3 KB Created: 2021-03-30 04:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7ddefe47d3e5f817781c73d963d956ea SHA-1: 837684a93e17daf657a09228669e812d1c5cd34e SHA-256: ca3e4ce435afcb1a1ad6bba0f67505fb2263134d56631957b0a856a81dadd9bd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://crophysi.ru/award?keyword=atrahasis+epos+pdf PDF link annotation
    • http://lobabinuladeri.medianewsonline.com/microsoft_machine_learning_cheat_sheet.pdfIn PDF document text
    • http://zusazibob.iblogger.org/10914336640.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://s3.amazonaws.com/xebuvuwov/how_to_measure_reinforced_steel_in_a_concrete_slab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396ee6b6-5dc4-4ab5-bde8-5ddddb205bb5/an_anthropologist_on_mars_seven_paradoxical_tales.pdfIn PDF document text
    • http://jetotajasavesi.atwebpages.com/39132679745.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_236520e6c20d478cb0ed5d063f69304e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/62727724654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c528d2eb-f02e-43fe-a636-024dbd746dde/82595668437.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/genokuduzezezujon.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/novibemujinizo.pdfIn PDF document text
    • http://nadejakajepog.epizy.com/zorugorajuzuzetasox.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/oreck_xl_element_vacuum_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e77f6ed8-7b25-4445-a104-153a23f4c189/92456813190.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/cisco_anyconnect_vpn_client_filehippo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d07eb3fe-0e62-4320-8451-96bb0d6232ed/migipopevasubakerijura.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/mi_camera_apk_xda.pdfIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_ca7d6437a06f480ab8b0669c2d19fd1e.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_5b54efaf512a4d389f5b8adba9f95026.pdf?index=trueIn PDF document text
    • https://3eeb541e-75be-486c-a732-b1e279b2a932.filesusr.com/ugd/eaab1c_90af6cc4a2de492e8ba305beb8157f6d.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_off00012127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 4768 bytes
SHA-256: e8102871c33e8e026be865460a378a7a028aca71e80ea048e3ff9fc018ef4c73
font_01_sfnt_off00013166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13166 14148 bytes
SHA-256: c20dc2efe472581809cb66dea515a2c19da61d12bebfc9ac8bf4e5e04011fa25
font_02_sfnt_off00015c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C7F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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