Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e73cb9c721a6c0a…

MALICIOUS

PDF

76.9 KB Created: 2021-05-20 19:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4dbf8aed7bf2df9fc1e802679fbf0be9 SHA-1: a2c0801174711588deaa6a2896c28c3a70e12211 SHA-256: 6e73cb9c721a6c0ae13acf5acd3b3c946163da29ed5f421d9bf1f7b25d945212
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly indicate maliciousness, likely through exploitation of a PDF vulnerability to execute code. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cdn-cms.f-static.net/uploads/4451355/normal_6061e74f4363e.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4377100/normal_5fff4ad01f923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474992/normal_602ff87e609bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5fc6028d154f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_603e8a6ba2042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473892/normal_604440ef1ff00.pdfIn PDF document text
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/5243090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_6027e1db94bda.pdfIn PDF document text
    • https://wojafegozotug.weebly.com/uploads/1/3/1/6/131606577/bowipobefiwolup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_5fdc93ee0d409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_605c1bdae76d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_604030974a1a0.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
    • http://feedproxy.google.com/~r/wb/ENAH/~3/3IgsHNHpEfs/wb?keyword=how%20to%20use%20a%20dremel%20multiproPDF link annotation
    • https://uploads.strikinglycdn.com/files/34f6ebd4-f07f-421e-97a9-dd89a1b07718/vumizojamumimedani.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/11858544821.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/lezomikimusinife.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/html_form_select_auto_submit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f232ea81-0720-4191-aae7-61668ae1309e/31999959828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30aa9cd9-2b80-48e9-a56a-09a6d1ff8302/what_to_know_before_buying_a_new_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a3518d-9a58-4ee5-9328-def8d94df1e6/how_to_use_grasshopper_rhino_5.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_off0000e00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 4936 bytes
SHA-256: cdadca12e2d3dc2b8a621aca7f5ec269cc65e801d95e2bd4793912dc76f5d195
font_01_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 11384 bytes
SHA-256: dda8efe2024bddc63a185d0303a2aaa5b45dc0c333281c8baf986dedafe34d86
font_02_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.