Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9af23c3dfb6f2c9…

MALICIOUS

PDF

76.9 KB Created: 2021-01-23 22:17:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3ad4cc150164a4050f0eea78a86d8c9b SHA-1: 70b8c680e337b23c40ab984afdddcea43b1c4989 SHA-256: b9af23c3dfb6f2c952012d28cfa04b96e9097b4410f21b6ae619e6df69e5661c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL found, https://baarspo.ru/123, suggests a phishing or spamming attempt. While no scripts were explicitly extracted, the presence of numerous external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent to redirect users to potentially harmful sites.

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://baarspo.ru/123?utm_term=1880+morgan+silver+dollar+san+francisco PDF link annotation
    • https://lufavivuda.weebly.com/uploads/1/3/4/3/134340228/buxopod.pdfIn PDF document text
    • https://cdn.sqhk.co/rowalulo/icSjeit/57319381555.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/fegizuxigipode_jugegotadoto_lopejotimisug.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/jcQHoge/tagaz.pdfIn PDF document text
    • https://zulanamojo.weebly.com/uploads/1/3/1/0/131071117/jogedowareb.pdfIn PDF document text
    • https://sowobufujugazid.weebly.com/uploads/1/3/0/8/130873997/4eeb92424ec2.pdfIn PDF document text
    • https://mutolumikiwow.weebly.com/uploads/1/3/1/8/131872082/58245.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/dOFDcii/munusavomuzulewobazupu.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/mefifejosakoxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495037/normal_5fe51299d8a36.pdfIn PDF document text
    • https://negozikazaseju.weebly.com/uploads/1/3/4/5/134587396/f202405b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/mathworksheets4kids_pair_of_angles_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/navepipedejapagekedu.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/82211405236.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/guxebonefepetaviladipoxip.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 5696 bytes
SHA-256: 3c0b34a12cfb6ea1691c68a32b4eba10d2bf2f7c767220711c1c378ca599f68d
font_01_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 10684 bytes
SHA-256: e207d54a905fa185e1f835ec484f574b3a5ce4657fb25ab304a25b541a75ba6d
font_02_sfnt_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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