Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52142f150ab8f90…

MALICIOUS

PDF

30.9 KB Created: 2020-05-19 05:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: c4113f16a19b35f4e9afab01eb728494 SHA-1: 70563c16901c1de603276b59137dcb635c8ba0ab SHA-256: a52142f150ab8f9055509e3867fa64b07e87afde5222d6a02ddea5799e22837b
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, many of which point to other PDF files with numeric slugs. This pattern is indicative of SEO spam or a link farm designed to distribute malicious content or manipulate search engine rankings. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://fluidspro.com/uploads/1/3/0/6/130621928/130621928.html#mia+malkova+white+yoga+pants PDF link annotation
    • http://crickethorse.com/uploads/1/3/1/4/131453847/zekiwetidibuju.pdfIn PDF document text
    • http://lifewaysforliving.com/uploads/1/3/0/5/130550660/70a0ec72c9f8ea3.pdfIn PDF document text
    • http://fuzzypawspetsit.com/uploads/1/3/1/0/131069897/rewiwoturibinux.pdfIn PDF document text
    • http://prestigemotorsportspr.com/uploads/1/3/1/6/131637881/14e0105.pdfIn PDF document text
    • http://campaigrelevance.com/uploads/1/3/1/4/131408029/todijusa_bagewi_gepop_gidora.pdfIn PDF document text
    • http://smoothteq.com/uploads/1/3/1/4/131483001/65b2e3257e.pdfIn PDF document text
    • http://rosehallhighland.org/uploads/1/3/0/9/130969587/7f32ffc1a08c4.pdfIn PDF document text
    • http://abodeluxury.com/uploads/1/3/0/6/130604620/lategofujefun_rotopapibaxu_zexarozipafek.pdfIn PDF document text
    • http://jaynewilsonnutrition.com/uploads/1/3/0/7/130775768/2625485.pdfIn PDF document text
    • http://crearchi.be/uploads/1/3/0/7/130776388/vososuxukerejofu.pdfIn PDF document text
    • http://concordantcapitalpropertymanagement.com/uploads/1/3/0/9/130969185/d2ffb.pdfIn PDF document text
    • http://raymondbishop.com/uploads/1/3/0/5/130550981/01ab45c9430.pdfIn PDF document text
    • http://dchighlandsweets.com/uploads/1/3/0/5/130552017/pudebonufumakukufepa.pdfIn PDF document text
    • http://westhollywood-rc.com/uploads/1/3/0/4/130488688/wavugu.pdfIn PDF document text
    • http://saalaw.org/uploads/1/3/0/5/130589218/9576089.pdfIn PDF document text
    • http://custom-granite.info/uploads/1/3/0/4/130488861/fufako.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F56 9608 bytes
SHA-256: d72c80cec69341dd6875b6c605013e7f111fe01d9efca749e870218110734749

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