Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d38e2b42928a7f…

MALICIOUS

PDF

33.9 KB Created: 2020-03-27 04:33:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 61d1f04be434a4af06dac5994f4151c6 SHA-1: cbd3738bbcedafc629f9d72a554ae4c7580cbe47 SHA-256: a1d38e2b42928a7f4fb13dde1ba3422ecea7dcfe1fbe45cc1180f56c9c8c69d2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or distribution network. The document body, though partially corrupted, contains references to 'Historia 3 telesecundaria volumen 1' and 'wkhtmltopdf', indicating it may be a lure for educational content or a generated document. The primary attack pattern involves directing users to these external resources, which could host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://utterlyabsent.com/uploads/1/3/1/3/131382539/131382539.html#historia+3+telesecundaria+volumen+1 PDF link annotation
    • http://mixedsf.com/uploads/1/3/0/2/130274316/9471c.pdfIn PDF document text
    • http://laureneg.com/uploads/1/3/0/7/130739251/tenagexijutuj.pdfIn PDF document text
    • http://massageinplano.com/uploads/1/3/0/4/130477040/2532564.pdfIn PDF document text
    • http://www.katielouisehackettdesigns.co.uk/uploads/1/3/0/6/130605217/lesubidejuburupovub.pdfIn PDF document text
    • http://aethenterprises.com/uploads/1/3/0/8/130813778/ea277b3be0a.pdfIn PDF document text
    • http://africanubuntusafaris.com/uploads/1/3/0/7/130775455/79540.pdfIn PDF document text
    • http://dns.mimosa.co.cr/uploads/1/3/0/6/130604176/kogebivemov.pdfIn PDF document text
    • http://ppaccttaxservices.com/uploads/1/3/0/4/130478163/3414939.pdfIn PDF document text
    • http://spiritisles.com/uploads/1/3/0/9/130969588/tojitajotun.pdfIn PDF document text
    • http://skyhighdronestore.com/uploads/1/3/0/6/130603989/bivulol-mavotikus-zinuxo-kinamalok.pdfIn PDF document text
    • http://asharperimage.ca/uploads/1/3/0/4/130491319/nogikexudi.pdfIn PDF document text
    • http://mail.arrowsmithchurch.com/uploads/1/3/0/6/130603922/zupot.pdfIn PDF document text
    • http://257bennettstreet.com/uploads/1/3/0/6/130639532/9113461.pdfIn PDF document text
    • http://www.thesouthproperties.com/uploads/1/3/0/2/130272072/eaf069.pdfIn PDF document text
    • http://plumbingsimivalley.net/uploads/1/3/0/4/130435990/3101454.pdfIn PDF document text
    • http://spokanehomeinspectornextjen.com/uploads/1/3/0/6/130639236/nejafadilagilu.pdfIn PDF document text
    • http://pgactivatorsociety.org/uploads/1/3/0/5/130590467/xoxera_podizogivaju_mikidemuru_gebutuzu.pdfIn PDF document text
    • http://jdstudy.net/uploads/1/3/0/7/130739117/8943072.pdfIn PDF document text
    • http://beardedbeaverco.com/uploads/1/3/0/4/130483795/f2bacae431a.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

Related samples 2

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_off00005de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE2 7188 bytes
SHA-256: cca2722b491972724fb87d8c7993bbda1dced6d1efda982cd8adffa40902347c

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