Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb730c3c3cb84ba…

MALICIOUS

PDF

83.4 KB Created: 2021-02-14 04:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c9aee7918c888b1ec950323896d0d85f SHA-1: ed08744133fa11f8d325bcdcbfae043014268591 SHA-256: 6cb730c3c3cb84bab197f1cdc1e388c712494f164925b224b3518a3ae0d7064d
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 0.9996

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://leonvi.ru/123?utm_term=trig+star+problem+local+contest+solutions PDF link annotation
    • https://wajevubal.weebly.com/uploads/1/3/4/6/134687537/serogozesolusu_gadunajelazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414152/normal_6012eac177235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388060/normal_6026dc55c5a79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_60107ef47bfbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_600a8f2772405.pdfIn PDF document text
    • https://fozipapuratub.weebly.com/uploads/1/3/6/0/136088586/1708775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492892/normal_5fccc32873001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417669/normal_5fcd83f2b462c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_5fd1336edf965.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487894/normal_5ff39d64874c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_5fda80f8357fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479435/normal_5ff899d9a6451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_60147fb661000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_600b37fa64853.pdfIn PDF document text
    • https://xelixexojiga.weebly.com/uploads/1/3/4/1/134108676/tugogefuvi.pdfIn PDF document text
    • http://www.opentle.orgIn 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/bisute/nier_automata_walkthrough_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/4589118879.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/xiaomi_mi_a2_android_one_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/dream_theater_live_at_luna_park.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e7c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE7C0 13676 bytes
SHA-256: d1bdf764aac5b647ecd3e1c3fc5aa375a2c0f9afb4b356074bea45353aab4cdf
font_00_sfnt_off0000d627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD627 5224 bytes
SHA-256: 24a6d4491bf357d1d7c2933f6a8ccebc0a5517f72039cb5a49f88aabcd5e8078
font_02_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 10280 bytes
SHA-256: 9f75eafeb92a6fd44d54f7dbf847cbb085d1fac6446a4688291fd544b3f33608
font_03_sfnt_off00013115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13115 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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