Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff11364d1a3ebbf…

MALICIOUS

PDF

91.7 KB Created: 2020-11-17 17:45:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f9f88f429ff76aa01383b91110542d80 SHA-1: da6e0f6f5dbb0f685c2afac4d3e2e97504b0b59a SHA-256: 5ff11364d1a3ebbf06588e92a1e709ab884af36582a0785fdef5a9eff9f1658f
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://traffset.ru/123?utm_term=heat+of+fusion+formula PDF link annotation
    • https://kukasoxijosip.weebly.com/uploads/1/3/4/4/134431535/693774.pdfIn PDF document text
    • https://rarasaxemog.weebly.com/uploads/1/3/4/6/134611000/82383502492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_5faa033a1ccd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412195/normal_5fa2068d3dc62.pdfIn PDF document text
    • https://davovexo.weebly.com/uploads/1/3/4/3/134355956/visipikakotufitegim.pdfIn PDF document text
    • https://milavigik.weebly.com/uploads/1/3/2/8/132815866/rugefosenakil.pdfIn PDF document text
    • https://birisudim.weebly.com/uploads/1/3/4/4/134467091/2c1473fc0.pdfIn PDF document text
    • https://mazazogadof.weebly.com/uploads/1/3/4/3/134374066/pominozuv.pdfIn PDF document text
    • https://vedakevuvapi.weebly.com/uploads/1/3/4/0/134013486/9405682.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/6415556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_5fa50739c4563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392442/normal_5f96f578d8531.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/gedesisumi/sebavifenaxadugel.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/miziwubudirezunuwesidu.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/38450021560.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/delta_burke_2020_image.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/ledupigegog.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012616.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12616 25296 bytes
SHA-256: eec116b4597edc5160d449b9aa560b27d7de7b983d0c6f0675f3e1f34ad81e49
font_00_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 4756 bytes
SHA-256: 4372bf7df3c7542b597a692acde4f90dc50fb2b60117fea96cad746fc42a28cc
font_01_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 12124 bytes
SHA-256: b8d16b013ffbebd159a3a012b45499577222841bd509e19d3c170782d8e7730f
font_03_sfnt_off00015311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15311 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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