Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aab264b1e1fa120…

MALICIOUS

PDF

46.3 KB Created: 2020-03-30 09:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 15a5fa4e449fc0d0ad71e033b0cc249f SHA-1: 21a76a8ad2095133e4958b4ce2c3ef8b46d7ecbc SHA-256: 6aab264b1e1fa120ce202f8750f1393d01f43c3569a1bc4a9bde32490aacdcdd
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs, suggesting a link farm or content distribution network. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to research design and the authoring application, likely serving as a lure to disguise the malicious intent of directing users to potentially harmful external sites.

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://74-123-77-115.mgwnet.com/uploads/1/3/0/3/130313000/130313000.html#dise%C3%B1o+de+investigacion+correlacional+segun+autores
    • http://eigenstate.solutions/uploads/1/3/0/6/130621926/kodavef.pdf
    • http://paradise-kdg.org/uploads/1/3/0/2/130273944/4987608.pdf
    • http://ricepaperstraw.com/uploads/1/3/0/7/130739405/pifegujinaf-sanoxutal.pdf
    • http://honeyholedepot.com/uploads/1/3/0/7/130740625/zozamokobubax_bosewonane.pdf
    • http://servingslore.com/uploads/1/3/0/8/130814078/mufawagobukog_jolulefa_kaziposage.pdf
    • http://www.splaxcustoms.com/uploads/1/3/1/4/131438888/6007315.pdf
    • http://rapidcadllc.com/uploads/1/3/0/4/130435988/tolonujima.pdf
    • http://bybuttertrade.com/uploads/1/3/0/6/130639356/592490.pdf
    • http://paulinamichnowska.com/uploads/1/3/0/6/130605230/5395127.pdf
    • http://ausprodetail.com/uploads/1/3/0/5/130545643/9593904.pdf
    • http://edwardsjewelryimports.com/uploads/1/3/0/8/130874544/9103625.pdf
    • http://iamyouraugustarealtor.com/uploads/1/3/0/7/130738969/tafojekor.pdf
    • http://dreamworldarts.com/uploads/1/3/0/6/130639395/taxasetopotaned_sazobonotosof.pdf
    • http://watermewell.info/uploads/1/3/0/6/130604594/perin.pdf
    • http://twinsmusicny.org/uploads/1/3/0/6/130604602/a2369a.pdf
    • http://nattassn.com/uploads/1/3/0/4/130491699/9169260.pdf
    • http://wedgesoverworkdays.com/uploads/1/3/1/0/131070216/sanatumivomu.pdf
    • http://marlabranch.com/uploads/1/3/0/6/130621276/8162301.pdf
    • http://sovereignhearthealing.com/uploads/1/3/0/4/130475909/kafes.pdf
    • http://brumleyevents.com/uploads/1/3/0/6/130604640/faruvidibetigexe.pdf
    • http://mobilemuttsrescue.com/uploads/1/3/1/4/131438206/252e1c1f0f17e.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008a44.bin
d403aee2f480d2f6e4ae4e02dfc352c23480a96d5d0d10acaa21ecc5a69862ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A44 8304 bytes

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