Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4fe1ec5b31a7d6…

MALICIOUS

PDF

95.2 KB Created: 2020-03-25 14:36:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 752163914421cb8b033fba6ccb4c2fb6 SHA-1: 5587293f4d12206f4b20e2a218bfa0abdc69b9df SHA-256: 4b4fe1ec5b31a7d62cd6cdf2d463bbbfeb14c0418f2778f6ca1f6e962c0241b8
136 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'Casos practicos de trabajo en equipo en empresas' (Practical cases of teamwork in companies). It embeds a large number of external links, identified as a link farm, pointing to various PDF files hosted on different domains. The primary heuristic indicates this is a PDF SEO link farm, suggesting the document's purpose is to drive traffic to these linked PDFs, likely for malicious purposes such as hosting further malicious content or phishing pages. No scripts were extracted from this sample.

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://wellwithacupuncture.com/uploads/1/3/1/3/131382886/131382886.html#casos+practicos+de+trabajo+en+equipo+en+empresas PDF link annotation
    • http://dewynns.com/uploads/1/3/0/2/130292179/venikewolibume.pdfIn PDF document text
    • http://www.stlhospitality.com/uploads/1/3/0/7/130776304/weraxonuketo-kusizeforeki-fajove.pdfIn PDF document text
    • http://aphrozone.us/uploads/1/3/0/7/130738564/putubawuwejid-kawewazes-xivokizibofe-konawojakoti.pdfIn PDF document text
    • http://redondoink.com/uploads/1/3/0/2/130287428/rerov.pdfIn PDF document text
    • http://gottusssafe.com/uploads/1/3/0/5/130588989/wagugetiditu_nupuri.pdfIn PDF document text
    • http://lowbrowdrifter.com/uploads/1/3/0/5/130539016/3239317.pdfIn PDF document text
    • http://theanonymousllama.com/uploads/1/3/0/9/130968973/jepukurowuwefo-lipavonu-folale.pdfIn PDF document text
    • http://motorpetroleum.com/uploads/1/3/0/6/130640142/sifukiwe.pdfIn PDF document text
    • http://mynerfbattleparty.com/uploads/1/3/0/8/130873846/1157395.pdfIn PDF document text
    • http://www.furrowsaliteraryjournal.com/uploads/1/3/0/5/130589010/989404.pdfIn PDF document text
    • http://whattimeisitinchina.com/uploads/1/3/0/4/130435772/e2069f.pdfIn PDF document text
    • http://amber-cano.rominastiebenphotography.com/uploads/1/3/0/8/130813514/lomegaz_gusawexiwozo_zorotukovanazo.pdfIn PDF document text
    • http://www.family-focus.co.nz/uploads/1/3/0/5/130541743/8428040.pdfIn PDF document text
    • http://boldnfearless.com/uploads/1/3/0/4/130483253/f5c690283ef28.pdfIn PDF document text
    • http://sugarlandtxpersonalinjurylawyers.com/uploads/1/3/0/6/130621706/c5bad.pdfIn PDF document text
    • http://meganfanningphotography.com/uploads/1/3/0/7/130775321/5211243.pdfIn PDF document text
    • http://ns1.topindo.com/uploads/1/3/0/8/130874455/lafobefepaxu.pdfIn PDF document text
    • http://enteroconsulting.com/uploads/1/3/0/7/130739982/bf9cbc81a3.pdfIn PDF document text
    • http://bassittdesigns.com/uploads/1/3/0/5/130551445/edb7c9933.pdfIn PDF document text
    • http://chunkeymonkey40.com/uploads/1/3/0/2/130273801/0791dd4.pdfIn PDF document text
    • http://thescotchapp.com/uploads/1/3/0/6/130604905/1cd89509.pdfIn PDF document text
    • http://studio-505.com/uploads/1/3/0/7/130775023/466b31.pdfIn PDF document text
    • http://noycenortheast.org/uploads/1/3/0/3/130323573/538926.pdfIn PDF document text
    • http://www.waterkloofmedical.com/uploads/1/3/0/4/130476043/wefelituzo.pdfIn PDF document text
    • http://rizwankassim.com/uploads/1/3/0/7/130740053/sodol.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 3

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_off000149d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D5 9780 bytes
SHA-256: 6221417d9ec181434b3f0c1dca89e0831a44b8e7633ac89764b35df275a8be31

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