Malicious PDF — malware analysis report

Static analysis result for SHA-256 158a5a49edc9c928…

MALICIOUS

PDF

100.6 KB Created: 2020-12-07 01:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 74ead9b51dd31d9929eb2ceb4c4ff612 SHA-1: d0ec558ba940ce4e82bb19eb1fa19254dcc7b70b SHA-256: 158a5a49edc9c928f6e9df61e964a609344f311b900b38474dc773cbca800792
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://traffking.ru/wb?keyword=electricity%20worksheet%20grade%208%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5f91fec580a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f88a563a8309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f97196d8bb7e.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4045700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f8ff65beb66a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415308/normal_5fab5de62c91b.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://static1.squarespace.com/static/5fc29ae5bdb33045eecd1eec/t/5fcae5169708706f39906b62/1607132438627/star_defender_pc_games_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/keletoka.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e7c288c99b6d37a72027/t/5fc1190e9ee0f32b8779c9fb/1606490383548/jevakivigotadejusoke.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc654757848ba205d3de070/t/5fc9ead1cf87d0256feff860/1607068371949/spinal_stenosis_surgery_risks.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/11442515167.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D7 5508 bytes
SHA-256: c3731060ff6c73cf76532132626dfaf117000f165860deee1b14e0526ed72d9e
font_01_sfnt_off000153c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153C1 10624 bytes
SHA-256: fd3c7342e051ea0bd2705be1a92da0399a1bf8e0608eef90e020d67566c9035a
font_02_sfnt_off00017802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17802 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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