Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d74ea914cb5d0dc…

MALICIOUS

PDF

79.6 KB Created: 2021-03-16 22:28:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c59ebe560de8271a53e2a6c907b8481e SHA-1: db052133680cd2492b42b1200753b37420076bbd SHA-256: 1d74ea914cb5d0dc934dcf1caba8d611bdc4038d7d29f1955ab51de05df3431a
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm. The ML classifier and ClamAV heuristic strongly indicate maliciousness, with ClamAV classifying it as Pdf.Phishing.Trojan. The embedded URLs suggest a phishing or SEO manipulation scheme, likely intended to direct users to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=how+much+money+does+a+safety+manager+make PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375891/normal_5fcc3c8541342.pdfIn PDF document text
    • https://kalaxokesipak.weebly.com/uploads/1/3/4/8/134888683/jelof.pdfIn PDF document text
    • https://refodalisa.weebly.com/uploads/1/3/4/4/134437853/rakizelatabu.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/oral_bioavailability.pdfIn PDF document text
    • http://dududuw.mypressonline.com/85706517045.pdfIn PDF document text
    • https://kutofepiv.weebly.com/uploads/1/3/4/8/134898103/3712177.pdfIn PDF document text
    • https://gizetaxawu.weebly.com/uploads/1/3/1/8/131871526/2654315.pdfIn PDF document text
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/f3c575a103d.pdfIn PDF document text
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/xamubeluferonufem.pdfIn PDF document text
    • http://kawafopi.mygamesonline.org/84824291117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5fcf97156331e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_3354442fdede4317acb19274f2040dd8.pdf?index=trueIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_ac4994f89897424eb3b441531432fcd2.pdf?index=trueIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_e499521d22984127b4742c6489714d09.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_0026a2312f8848deb1b43d3e0a1d94b9.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_ce96a072605e42c49b011588683cf4c7.pdf?index=trueIn PDF document text
    • http://zuputes.atwebpages.com/63108085147.pdfIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_f0a30fe0e1124dcd96871f7d194d1b69.pdf?index=trueIn 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_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 5624 bytes
SHA-256: 86263619085344a21adf92d6f885c7b4f35002d42ef64ac1085bf29309208d23
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 11072 bytes
SHA-256: 174459fe1eab7cc96295372a11883d3b61bcf8695095965b7136c232912c9eb6
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 16080 bytes
SHA-256: cb2ab70465108ce6c84721151322b6eb18361c8c08d23d343aeecc820982f7ab