Malicious PDF — malware analysis report

Static analysis result for SHA-256 2648a17f771a39fb…

MALICIOUS

PDF

76.9 KB Created: 2020-11-20 10:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 64a2c43362e0557bc29ea4eaa6250c66 SHA-1: d8ac17d623b0431889b044ff6d635f7d56fdfb3a SHA-256: 2648a17f771a39fb4f1a275870a3f389c8bdd258fddcff34f2fa379783dabd34
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains a query about fluid ounces in a cup, which is likely a lure to disguise the malicious intent of directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+many+fluid+ounces+in+a+red+solo+cup PDF link annotation
    • https://mifopezuzata.weebly.com/uploads/1/3/4/4/134484464/kizidabiw.pdfIn PDF document text
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/5722050.pdfIn PDF document text
    • https://luxofivova.weebly.com/uploads/1/3/4/7/134745836/5aa8440e9450.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/sunokirekujaju-musafugatepifo-kesowekal-karatijosol.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/wokute_motudazireporut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5f8927f034dbb.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/megelugik/60914631707.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/livro_de_desassossego_fernando_pessoa.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/ccleaner_filehippo_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/cervicogenic_vertigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/223223f3-93ea-4ec7-b8c9-86318dc9109a/tejido_conjuntivo_laxo_caracteristicas.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/lagadepus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b25e409f-85e8-4ab2-ad4a-df3906f252b4/nijidawigelodipefegu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 5256 bytes
SHA-256: 44903d7ab75ebdd547dcaeb82645a07487afa36604afa4e0934c2a050970699e
font_01_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 10896 bytes
SHA-256: 469fad250cfd048c520a617ce7ff0d53e61994eec1541f4d90ddbc9b07b02353
font_02_sfnt_off00011846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11846 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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