Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b1472d2cb4f8f2…

MALICIOUS

PDF

46.1 KB Created: 2020-03-08 11:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: dcb3e4665f14189cf9ecc80c0b9c673b SHA-1: c3e85d8d1d97d0f478d4e2e28fa46df876672ba2 SHA-256: b9b1472d2cb4f8f2832da4b0249852dd6c9c3f1bb77b9f34267a81ede2e3a259
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to drive traffic or host malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://vps22-makerton-inc.pleasingfood.com/uploads/1/3/0/6/130604286/130604286.html#section+modulus+of+a+hollow+rectangle PDF link annotation
    • http://indianapolisjanitorialsupplies.com/uploads/1/3/0/2/130273766/wefesog.pdfIn PDF document text
    • http://ambermayde.shop/uploads/1/3/0/5/130539437/sodedudema.pdfIn PDF document text
    • http://pourtoninfo.com/uploads/1/3/0/5/130540010/f2242e77b1c.pdfIn PDF document text
    • http://shadowbendtest6.com/uploads/1/3/0/4/130483302/364615.pdfIn PDF document text
    • http://www.teachingtechy.com/uploads/1/3/0/7/130775655/3342254.pdfIn PDF document text
    • http://richardtallent.net/uploads/1/3/0/4/130488615/nomon_japowukigezapex.pdfIn PDF document text
    • http://jennaluna.com/uploads/1/3/0/2/130288419/886291.pdfIn PDF document text
    • http://visitwesternheritagecenter.org/uploads/1/3/0/7/130776828/1330917.pdfIn PDF document text
    • http://waltzerbooth.com/uploads/1/3/0/4/130483912/zezikofiwumipedemubi.pdfIn PDF document text
    • http://b-24-thegreenhornet.net/uploads/1/3/0/3/130323255/zetiw.pdfIn PDF document text
    • http://mapamls.com/uploads/1/3/0/4/130475938/ca3f4.pdfIn PDF document text
    • http://littlemonstersartstudio.com/uploads/1/3/0/6/130621912/zepoxomeme.pdfIn PDF document text
    • http://bulletmotorsport.com/uploads/1/3/0/7/130739720/7672879.pdfIn PDF document text
    • http://www.kin-onlinepov.com/uploads/1/3/0/5/130551231/vejunere.pdfIn PDF document text
    • http://frontline-fit.com/uploads/1/3/0/4/130488412/6f7c7dc.pdfIn PDF document text
    • http://www.solreta.com/uploads/1/3/0/7/130775730/3843839.pdfIn PDF document text
    • http://robiskincare.ca/uploads/1/3/0/2/130291471/xiteropox-savakavaxo.pdfIn PDF document text
    • http://nerdfinance.net/uploads/1/3/0/7/130739983/junozen-bojiduvemew-malepagana-xugisarogigom.pdfIn PDF document text
    • http://nikkileeyoga.com/uploads/1/3/0/4/130476370/bowetip-nukofopafama-wotijekotug-gotinem.pdfIn PDF document text
    • http://edgeathletics.pro/uploads/1/3/0/8/130813972/b39239da39620ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC3 8512 bytes
SHA-256: d767c5569a8fcbdc26e0f8d8e52e917fe31fd0489f8cc49bb6a81449d0167708
font_01_sfnt_off00009fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FBB 3016 bytes
SHA-256: 43dc70b6a2d0f0400e5080c2cfef1bfa0583bf77e56b06911b007d479388fc01

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