Malicious PDF — malware analysis report

Static analysis result for SHA-256 accd93e1a98465d8…

MALICIOUS

PDF

53.8 KB Created: 2020-03-27 09:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: c0d31f4a512e9b301ae5028c2d633275 SHA-1: 33c9b74dcff5f944f6e52460e3361139b2e01ad3 SHA-256: accd93e1a98465d80e878782ea3b9d5118939a590dd95cf8e64c8d77bbf4cbf2
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, a technique often used for SEO spam or to redirect users to malicious sites. The document body, though partially corrupted, contains text related to calculating domains of exponential functions, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent. No scripts were extracted from this sample.

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://serafinaappel.com/uploads/1/3/0/4/130436202/130436202.html#calcular+dominio+de+funciones+exponenciales PDF link annotation
    • http://oddenilssen.com/uploads/1/3/0/3/130313613/zemozabovivi.pdfIn PDF document text
    • http://misspeggysdogwalking.com/uploads/1/3/0/3/130379529/togovinokivu.pdfIn PDF document text
    • http://cleomasia.com/uploads/1/3/0/5/130551202/vusut.pdfIn PDF document text
    • http://just4funpartysupply.com/uploads/1/3/0/6/130621917/lasisuba.pdfIn PDF document text
    • http://mail.briketes.eu/uploads/1/3/1/0/131071057/vufivusubodotose.pdfIn PDF document text
    • http://mail.asplashofglamour.com/uploads/1/3/0/6/130621137/17a9626e.pdfIn PDF document text
    • http://gettingcrystalclear.com/uploads/1/3/0/6/130639442/d444be0a.pdfIn PDF document text
    • http://cydanceintensive.com/uploads/1/3/0/8/130814430/wikegifolozife.pdfIn PDF document text
    • http://hca4u.com/uploads/1/3/0/6/130639214/zafeku.pdfIn PDF document text
    • http://www.what-if-i-tangle.org/uploads/1/3/0/6/130621421/13b63.pdfIn PDF document text
    • http://desic.com/uploads/1/3/0/2/130274376/aa7026b4.pdfIn PDF document text
    • http://www.novelideapr.com/uploads/1/3/0/3/130379228/c36e9f0.pdfIn PDF document text
    • http://hoiann.com/uploads/1/3/0/6/130620437/pobujofotej.pdfIn PDF document text
    • http://noahlang.net/uploads/1/3/0/7/130738641/zuxugi_juduxumurejok_xutunapesope.pdfIn PDF document text
    • http://naruebordin.com/uploads/1/3/0/3/130379174/zireziru_ropivodaror_biworazetu.pdfIn PDF document text
    • http://intelli-sched.net/uploads/1/3/0/4/130490808/9734438.pdfIn PDF document text
    • http://letstalkdogs.net/uploads/1/3/0/5/130544318/ab0627fb013.pdfIn PDF document text
    • http://asimpleido.net/uploads/1/3/0/5/130551248/rewuzubotejizupujela.pdfIn PDF document text
    • http://flawlessdomesticandcommercialcleaningservices.com/uploads/1/3/0/6/130620268/750512.pdfIn PDF document text
    • http://sound-systems.net/uploads/1/3/0/6/130621022/xoroz-vodobibunijera-kulodiwajetovu.pdfIn PDF document text
    • http://culebrasailingcharters.com/uploads/1/3/0/6/130620345/zojufadukak.pdfIn PDF document text
    • http://www.bulldogcleaningandrestoration.org/uploads/1/3/0/9/130969334/tukinevo.pdfIn PDF document text
    • http://hypernox.net/uploads/1/3/0/8/130873861/cca7a77f1f.pdfIn PDF document text
    • http://merryhillcbd.com/uploads/1/3/0/3/130323635/8074342.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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_off00009290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9290 7936 bytes
SHA-256: 084b3f8b81bc6e3cda668d84fffb3fcc5b834463730279700d23bc3c073875ab
font_01_sfnt_off0000b17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17F 16204 bytes
SHA-256: f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d

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